OrgoMech is an iOS app for organic chemistry students and pre-meds. You draw or pick a reactant, add reagents, predict the major product, then practice ordering the curved-arrow mechanism steps — the same skills tested on exams and the MCAT.

Is OrgoMech good for MCAT organic chemistry?

Yes. OrgoMech focuses on reaction outcomes, stereochemistry, and mechanism arrow-pushing — core skills for the organic chemistry section of the MCAT and undergraduate orgo courses.

How is OrgoMech different from memorizing reactions?

Instead of isolated facts, you see why a product wins (regiochemistry and stereochemistry) and practice electron-pushing in sequence. The reaction library groups mechanisms by type with the trap answers students confuse on tests.

Does OrgoMech include a reaction mechanism practice mode?

Yes. After predicting the product, you order the mechanism steps — nucleophile attack, leaving group departure, and pi bond formation — matching graded mechanism questions.

Where can I download OrgoMech?

OrgoMech is available on the Apple App Store for iPhone and iPad in the United States and other regions where the app is listed. Use the Download on the App Store link on this site.

Are these guides enough to replace my textbook?

No. They are review companions for mechanisms and product prediction, not a full course. Use them alongside your lectures, problem sets, and professor’s practice exams.

Who are the mechanism hubs written for?

Primarily U.S. undergraduate organic chemistry students and pre-meds preparing for course exams or MCAT-style reasoning. Content is in English (en-US) with exam-style framing.

How should I use the practice prompts at the end of each hub?

Attempt them on paper without notes, then check your product and stereochemistry. If you miss one, write the correct curved-arrow sequence in three steps or fewer before moving on.

Which hub should I read first?

Follow your syllabus. Most students start with SN1 vs SN2 in orgo 1. In orgo 2, the carboxylic acid derivatives hub (esters, amides, acyl substitution) matches a full unit on many U.S. campuses — it is the highest-value addition after substitution and the MCAT pillar page.

Do you have a guide for esters, amides, and acyl substitution?

Yes — the carboxylic acid derivatives hub covers nucleophilic acyl substitution, reactivity order, Fischer esterification, saponification, and amide formation, with exam traps and practice prompts aligned to undergraduate orgo 2.

Do the hubs cover spectroscopy or lab techniques?

These hubs focus on reaction mechanisms and functional-group reactivity, not NMR/IR problem sets or lab write-ups. Spectroscopy may appear in passing when it affects structure identification.

Is there an MCAT-specific guide on this site?

Yes. The MCAT organic chemistry pillar page links to every mechanism hub and includes a longer study plan for pre-meds integrating undergraduate orgo with passage-style practice.

How do the hubs relate to the OrgoMech iOS app?

The web guides are free to read. The app adds structure drawing, product prediction, and ordering mechanism steps on your phone — optional practice after you use the hubs for concepts.

Organic chemistry mechanism hubs for course exams and MCAT review

Free undergraduate orgo guides: stereochemistry (R/S, meso), SN1 vs SN2, E1 vs E2, alkene addition, Grignard, carbonyls, carboxylic acid derivatives, and EAS — exam traps, FAQs, and practice prompts (en-US).

Guides are in English (en-US), aimed at U.S. undergraduate organic chemistry and MCAT preparation. Start with the MCAT organic chemistry pillar page for a full study plan.

Highest-impact hubs for search and syllabi

After the MCAT pillar, undergraduate courses and Google queries cluster on SN1/SN2 and carboxylic acid derivatives — esters, amides, and nucleophilic acyl substitution. Start there if you are building an orgo 2 review stack.

All mechanism hubs

Related study plans on OrgoMech

MCAT organic chemistry study plan
Pre-med pacing, what the MCAT tests, and links to every mechanism hub.
Study guides by goal
Final exam, midterm week, and curved-arrow practice plans.
How to study for orgo final
Mechanism arrow-pushing practice

Open organic chemistry textbooks & references

Open textbooks and reference sites for the same topics covered above. We link out to established science education publishers — not affiliate pages.

Organic Chemistry (OpenStax) — OpenStax
Organic Chemistry LibreTexts — LibreTexts
MIT OpenCourseWare — Organic Chemistry I — MIT OCW
PubChem — NIH NLM

Questions about these mechanism hubs

Answers for students browsing free orgo content before an exam.

What are OrgoMech mechanism hubs?: They are free, open web guides on this site — one page per major undergraduate topic (stereochemistry, SN1/SN2, E1/E2, alkene addition, Grignard, carbonyls, carboxylic acid derivatives, aromatic substitution). Each hub includes a short lesson, exam traps, practice prompts, and links to related guides.
Are these guides enough to replace my textbook?: No. They are review companions for mechanisms and product prediction, not a full course. Use them alongside your lectures, problem sets, and professor’s practice exams.
Who are the mechanism hubs written for?: Primarily U.S. undergraduate organic chemistry students and pre-meds preparing for course exams or MCAT-style reasoning. Content is in English (en-US) with exam-style framing.
How should I use the practice prompts at the end of each hub?: Attempt them on paper without notes, then check your product and stereochemistry. If you miss one, write the correct curved-arrow sequence in three steps or fewer before moving on.
Which hub should I read first?: Follow your syllabus. Most students start with SN1 vs SN2 in orgo 1. In orgo 2, the carboxylic acid derivatives hub (esters, amides, acyl substitution) matches a full unit on many U.S. campuses — it is the highest-value addition after substitution and the MCAT pillar page.
Do you have a guide for esters, amides, and acyl substitution?: Yes — the carboxylic acid derivatives hub covers nucleophilic acyl substitution, reactivity order, Fischer esterification, saponification, and amide formation, with exam traps and practice prompts aligned to undergraduate orgo 2.
Do the hubs cover spectroscopy or lab techniques?: These hubs focus on reaction mechanisms and functional-group reactivity, not NMR/IR problem sets or lab write-ups. Spectroscopy may appear in passing when it affects structure identification.
Is there an MCAT-specific guide on this site?: Yes. The MCAT organic chemistry pillar page links to every mechanism hub and includes a longer study plan for pre-meds integrating undergraduate orgo with passage-style practice.
How do the hubs relate to the OrgoMech iOS app?: The web guides are free to read. The app adds structure drawing, product prediction, and ordering mechanism steps on your phone — optional practice after you use the hubs for concepts.

Turn guides into graded-style practice

OrgoMech shows the major product, then lets you order the mechanism steps — built for finals and the MCAT orgo section.

Download on theApp Store

Organic chemistry mechanism hubs for course exams and MCAT review

Highest-impact hubs for search and syllabi

All mechanism hubs

SN1 vs SN2: how to pick the mechanism and predict stereochemistry

R/S configuration, enantiomers, diastereomers, and meso compounds — orgo & MCAT

E1 vs E2 elimination: Zaitsev, anti-periplanar geometry, and product prediction

Alkene addition: Markovnikov, anti addition, and reagent-specific outcomes

Grignard reaction mechanism: formation, carbonyl addition, and what destroys your reagent

Carbonyl reactions: hemiacetal, aldol, and nucleophilic acyl substitution

Esters, amides, and acyl substitution: reactivity order and exam traps

Electrophilic aromatic substitution: directing groups and Friedel–Crafts

Related study plans on OrgoMech

Open organic chemistry textbooks & references

Questions about these mechanism hubs

Turn guides into graded-style practice