Organic Chemistry Help: Video Lessons & Practice
Step-by-step lessons on reactions, mechanisms, and lab techniques — so you're ready for your next exam.
Certified-Teacher Concept Videos
Watch experienced instructors break down reaction mechanisms and functional groups step by step — so you understand the method, not just the answer, and carry that knowledge into Orgo II.
Diagnostic Assessment + Adaptive Practice
A quick diagnostic pinpoints exactly where you're struggling — mechanisms, stereochemistry, or nomenclature — so every practice session targets your real gaps, not time you don't have.
Exam-Ready Practice Tests
Tackle organic chemistry practice tests and mock midterms built around the topics your course actually covers — so you walk into finals confident, not cramming.
Organic Chemistry Topics
1. Introduction to Organic Chemistry
2. Intro to Atomic and Molecular Structure
3. Chemical analysis and structure determination
4. Introduction to organic reactions, reactivity and mechanisms
4 Chapters · 24 Topics · 191 Videos
Discover Our Learning Areas
Explore key subjects and start learning with interactive content.
What Is Organic Chemistry?
Organic Chemistry is the branch of chemistry concerned with the structure, properties, composition, reactions, and synthesis of carbon-containing compounds. It is a mandatory course for pre-med, pre-pharmacy, biochemistry, and chemical engineering students — and one of the most intellectually demanding courses in an undergraduate science degree. The central skill is mechanistic reasoning: learning to predict how electrons move, bonds break, and new bonds form based on molecular structure and reaction conditions.
Most US universities divide the subject into Organic Chemistry I and Organic Chemistry II. The first semester establishes the conceptual foundation — hybridization, stereochemistry, and the core substitution and elimination mechanisms. The second semester applies that foundation to more complex functional group transformations, multi-step synthesis, and spectroscopic structure determination. Together, these two courses build the chemical literacy that underpins Biochemistry, Pharmacology, and Medicinal Chemistry.
Why Is Organic Chemistry So Difficult?
The difficulty of Organic Chemistry is real, but it is frequently misunderstood. The course is not hard because it contains an enormous amount of factual content to memorize — it is hard because it demands a fundamentally different mode of thinking. Students who approach orgo the way they approached General Chemistry (memorizing formulas and plugging in numbers) hit a wall very quickly. There are thousands of named reactions, and no one memorizes them all.
The students who do well learn to reason from a small set of principles: electron-rich species attack electron-poor ones; leaving groups depart when a better nucleophile or base is present; steric and electronic effects determine which pathway dominates. Once those principles are internalized, most reactions become predictable rather than arbitrary. That shift — from memorization to mechanistic intuition — is the real learning curve in Organic Chemistry, and it usually happens somewhere in the middle of Orgo I if students are working problems daily.
Common difficulty spikes include stereochemistry (assigning R/S and predicting reaction stereochemistry), curved-arrow formalism (drawing electron movement correctly), carbonyl reactions (distinguishing nucleophilic addition from substitution), and NMR spectroscopy (interpreting chemical shift, splitting patterns, and integration). Each of these responds well to consistent practice with immediate feedback — working a mechanism and checking your arrow-pushing against a step-by-step solution is far more effective than re-reading lecture notes.
What Are the Core Reaction Mechanisms in Organic Chemistry?
Reaction mechanisms are the heart of Organic Chemistry. Rather than memorizing individual reactions, understanding the following mechanism families lets you predict outcomes across hundreds of transformations:
Nucleophilic Substitution (SN1 and SN2): The SN2 mechanism is a concerted backside attack — one step, inversion of configuration, favored at primary carbons with strong nucleophiles in polar aprotic solvents. The SN1 mechanism proceeds through a carbocation intermediate — two steps, racemization, favored at tertiary carbons with weak nucleophiles in polar protic solvents. The ability to distinguish which pathway dominates based on substrate, nucleophile, and solvent is one of the most tested skills in Orgo I.
Elimination (E1 and E2): These compete directly with substitution. E2 is concerted and anti-periplanar, favored by bulky strong bases; E1 goes through a carbocation and favors higher-substituted alkenes via Zaitsev's rule. The substitution-vs-elimination competition question appears on virtually every Organic Chemistry midterm.
Electrophilic Addition: Alkenes react with electrophiles according to Markovnikov's rule (the carbocation intermediate forms at the more-substituted carbon). Halogenation, hydration, hydrohalogenation, and epoxidation are key reactions here.
Carbonyl Chemistry: In Orgo II, nucleophilic addition to aldehydes and ketones, nucleophilic acyl substitution at carboxylic acid derivatives, and enolate chemistry dominate. The carbonyl carbon is electrophilic; nucleophiles attack it from the less-hindered face.
Working through each mechanism family with a step-by-step approach — drawing every intermediate, every curved arrow — builds the pattern recognition that makes exam problems feel familiar rather than novel.
How Is Organic Chemistry Graded at US Universities?
Assessment structures vary by institution, but the most common format at US universities weights two or three midterm exams at approximately 50–60% of the final grade, a comprehensive final exam at 25–35%, and weekly problem sets or lab reports for the remaining portion. Some courses include regular quizzes to enforce consistent engagement with the material.
Exam questions are overwhelmingly mechanism-based: given a starting material and reagents, draw the major product and provide a stepwise mechanism with curved arrows. Spectroscopy problems (assigning an unknown structure from IR and NMR data) appear frequently in Orgo II finals. Multiple-choice questions may appear on some midterms but rarely constitute the majority of the exam.
Pre-med students should note that the MCAT tests Organic Chemistry content extensively — reaction mechanisms, functional group reactivity, stereochemistry, and spectroscopy all appear in the Chemical and Physical Foundations section. Building strong exam skills in your university orgo courses directly prepares you for that standardized test as well.
What Are the Prerequisites for Organic Chemistry, and What Comes Next?
Virtually all US universities require General Chemistry I and II as prerequisites for Organic Chemistry I. Key concepts to have firmly in place before starting orgo include Lewis structures, VSEPR geometry, molecular polarity, acid-base equilibria (especially pKa reasoning), and a basic understanding of thermodynamics and kinetics. Students who are shaky on those fundamentals often find the first few weeks of Orgo I overwhelming.
After completing Orgo I and II, the natural progression for most science majors is Biochemistry — a course that assumes fluency with the functional groups and reaction types from organic chemistry and applies them to biological macromolecules and metabolic pathways. Chemistry and chemical engineering majors may continue to Advanced Organic Chemistry, Physical Organic Chemistry, or Polymer Chemistry. Pharmacy and pre-med students will see organic chemistry resurface in Pharmacology, where reaction mechanisms explain drug metabolism and molecular interactions.
Why StudyPug for Organic Chemistry Help?
Organic Chemistry is a course where the method you use to study matters as much as the hours you put in. Passive re-reading of lecture notes and textbooks is one of the least effective strategies — yet it is what most students default to. StudyPug is built around active learning: working problems, getting immediate step-by-step feedback, and watching an experienced instructor walk through the reasoning when you get stuck.
StudyPug's diagnostic assessment identifies exactly where your understanding breaks down before you waste hours on topics you already know. If you can handle SN2 but consistently lose points on stereochemistry, the diagnostic finds that and sends you directly to the targeted practice and video lessons that address it.
The certified-teacher concept videos are not AI-generated walkthroughs — they are lessons made by experienced instructors who understand where students get confused. Each video teaches the underlying method: why the electrons move the way they do, what determines regioselectivity, how to read a reaction condition and anticipate the mechanism. That depth of explanation is what prepares you for the next exam question, not just the example you watched.
Adaptive practice adjusts to your performance in real time, ensuring you are always working at the level that builds skill rather than boredom or frustration. One subscription covers Organic Chemistry I and II along with General Chemistry, Biochemistry, and every other course in the StudyPug library — so you are never one course away from needing a separate resource.
What You Learn in Organic Chemistry — Course Coverage
A full two-semester Organic Chemistry sequence at a US university typically covers the following topic areas. StudyPug provides video lessons and practice problems across all of them:
Orgo I Topics: molecular structure and bonding; hybridization (sp, sp2, sp3); functional group families; stereochemistry (chirality, R/S assignment, enantiomers, diastereomers, meso compounds); conformational analysis (Newman projections, cyclohexane chair flips); acids and bases (pKa, resonance, inductive effects); nucleophilic substitution (SN1, SN2); elimination reactions (E1, E2, Zaitsev's rule); electrophilic addition to alkenes and alkynes; radical reactions.
Orgo II Topics: conjugation and resonance; aromatic chemistry (Hückel's rule, electrophilic aromatic substitution, directing effects); alcohols, ethers, and epoxides; carbonyl chemistry (aldehydes and ketones — nucleophilic addition, Wittig reaction); carboxylic acids and derivatives (nucleophilic acyl substitution); enolate chemistry (aldol condensation, Claisen condensation); amines; spectroscopy (IR spectroscopy, 1H and 13C NMR, mass spectrometry); multi-step synthesis strategy.
Because no validated internal topic URLs are currently available in the StudyPug sitemap for Organic Chemistry, use the main Organic Chemistry course page as your entry point and explore topic coverage from there. StudyPug's full topic library for the course is accessible once you are inside the platform.
How to Use StudyPug for Organic Chemistry Practice
The most effective way to use StudyPug for Organic Chemistry is to treat it as your active-practice layer on top of your lectures — not a replacement for attending class, but the place where understanding solidifies.
Start with the diagnostic. Before your first study session, run the diagnostic assessment. It takes a few minutes and immediately shows you which topic areas need the most attention. This prevents the common mistake of spending three hours on reactions you already understand while neglecting the mechanism that will cost you points on the midterm.
Watch, then practice. When you encounter a topic you are shaky on, watch the concept video first — not to take notes, but to follow the instructor's reasoning. Then immediately attempt practice problems on that topic. The combination of seeing the method explained and then executing it yourself under low-stakes conditions is what builds lasting understanding.
Use practice tests to simulate exam conditions. StudyPug's organic chemistry practice tests are designed around the difficulty and question types that appear on university midterms and finals. Work through a full practice test under timed conditions, mark your answers, then go back and watch the solution video for every question you missed. This review step is where most learning actually happens.
Watch solutions as many times as you need. One of the concrete advantages of video-based learning is that you can pause, rewind, and re-watch a mechanism explanation until it makes sense. There is no penalty for watching a solution three times — and for orgo, that level of repetition is often exactly what it takes for a new mechanism to become intuitive.
Consistent use of free practice content before committing to a plan means you can evaluate whether StudyPug's approach works for you before spending a dollar. When you are ready for full access, every plan is backed by a 30-day money-back guarantee.
Organic Chemistry FAQ
Unsure how StudyPug works? Need help with setting up? Check our frequently asked questions or contact us for help.
What do you learn in Organic Chemistry, and what topics does it cover?
Organic Chemistry covers the structure, properties, and reactions of carbon-based compounds. Core topics include nomenclature, functional groups, stereochemistry (chirality, enantiomers, diastereomers), reaction mechanisms (SN1, SN2, E1, E2), acid-base chemistry, carbonyl chemistry, and spectroscopy (IR, NMR, MS). Most university courses split into Orgo I (foundational mechanisms) and Orgo II (advanced synthesis and spectral analysis). By the end, you can predict how molecules react and design multi-step synthesis pathways — skills essential for pre-med, pharmacy, and chemistry majors.
What is the difference between Organic Chemistry I and Organic Chemistry II?
Organic Chemistry I focuses on foundational concepts: bonding, hybridization, stereochemistry, and core substitution and elimination reactions (SN1, SN2, E1, E2). Organic Chemistry II builds on those mechanisms to cover carbonyl chemistry (aldehydes, ketones, esters, amides), conjugation, aromatic reactions (electrophilic aromatic substitution), and spectroscopic identification (NMR and IR). Orgo I is about understanding why reactions happen; Orgo II is about using that understanding to design multi-step synthesis routes and interpret spectra. Strong mechanism intuition in Orgo I directly determines how manageable Orgo II feels.
What are the prerequisites for Organic Chemistry, and what course comes after it?
Most universities require General Chemistry I and II (covering bonding, thermodynamics, and equilibrium) before Organic Chemistry. A solid grasp of Lewis structures and molecular polarity is essential from day one. After completing Orgo I and II, students typically move on to Biochemistry, where organic reaction mechanisms appear constantly in metabolic pathways. Pre-med and pre-pharmacy students also encounter organic chemistry concepts heavily on the MCAT. Some programs offer Advanced Organic Chemistry or Medicinal Chemistry for students continuing in a chemistry or pharmaceutical track.
Is Organic Chemistry hard, and where do students struggle most?
Organic Chemistry has a reputation as one of the most challenging undergraduate science courses, and that reputation is earned. The biggest struggle is mechanistic reasoning — students accustomed to memorizing facts try to memorize hundreds of reactions individually, which doesn't scale. The solution is learning the underlying electron-pushing logic so you can derive reactions rather than recall them. Stereochemistry (keeping track of 3D geometry) and spectroscopy (reading NMR spectra) are two other major difficulty spikes. Consistent daily practice and working through mechanisms step by step — rather than passively re-reading — is the approach that works.
How is Organic Chemistry assessed — midterms, finals, and assignments?
A typical US university Organic Chemistry course weights two or three midterm exams at around 50–60% of the grade, a comprehensive final exam at 25–35%, and lab reports or problem sets for the remaining portion. Exams are almost entirely mechanism-based: you are given a starting material and reagents and asked to draw the product and explain the mechanism with curved arrows. Multiple-choice questions may appear on some midterms. The MCAT tests organic chemistry content heavily for pre-med students, making strong exam preparation critical beyond just passing the course.
What is one of the hardest topics in Organic Chemistry, and how do you approach it?
Stereochemistry — specifically assigning R/S configuration and predicting stereochemical outcomes of reactions — consistently trips students up. The difficulty is spatial: you must mentally rotate three-dimensional molecules and track which face of a bond is attacked. The right approach is to stop memorizing individual outcomes and instead learn the underlying geometry: for SN2, the nucleophile always attacks the back face (inversion); for addition to a carbonyl, the nucleophile approaches the less-hindered face. Drawing 3D wedge-dash structures for every problem, rather than shortcutting with line structures, builds the spatial intuition that makes stereochemistry predictable.
