GPAT Organic Chemistry Syllabus

Organic Chemistry syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Organic Chemistry in GPAT, not a summary of it.

1. 1

   General Principles

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

2. 2

   Pericyclic Reactions

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

3. 3

   Aromaticity & Chemistry of Aromatic Compounds

   3 topics

   • Different Classes of Compounds
     • Aromatic Hydrocarbons
     • Aromatic Heterocycles
   • Amino Acids & Proteins
   • Polycyclic Aromatic Hydrocarbons
4. 4

   Stereochemistry

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

5. 5

   Carbohydrates

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

6. 6

   Carbonyl Chemistry

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

7. 7

   Heterocyclic Chemistry

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

8. 8

   Protection & Deprotection of Groups

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

9. 9

   Bridged Rings

   overview

   Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

10. 10

    Kinetic & Thermodynamic Control

    overview

    Examined as a single unit within Organic Chemistry — no further topic split in the official outline.

Organic Chemistry flashcards for GPAT

25 of 50 cards from the Organic Chemistry deck — real questions with worked answers.

1. What is the general functional group of an alcohol, and how are alcohols classified as primary, secondary, and tertiary?

   Functional group: hydroxyl (-OH). Primary (1deg): -OH carbon attached to one other carbon; secondary (2deg): attached to two carbons; tertiary (3deg): attached to three carbons.

2. Distinguish between an aldehyde and a ketone by structure and general formula.

   Aldehyde: carbonyl (C=O) with at least one H on the carbonyl carbon (R-CHO). Ketone: carbonyl flanked by two carbon groups (R-CO-R'). Both share the formula CnH2nO for saturated members.

3. What is the functional group of a carboxylic acid and its general formula?

   Functional group: carboxyl (-COOH), a carbonyl plus hydroxyl on the same carbon. General formula: R-COOH (CnH2nO2 for saturated monocarboxylic acids).

4. Name the four main classes of carboxylic acid derivatives in decreasing order of reactivity toward nucleophilic acyl substitution.

   Acid halides (most reactive) > anhydrides > esters > amides (least reactive).

5. How are amines classified as primary, secondary, and tertiary?

   Based on the number of carbon (alkyl/aryl) groups bonded to nitrogen: primary (1 group, RNH2), secondary (2 groups, R2NH), tertiary (3 groups, R3N).

6. What is the general structure of an ester and how is it named?

   Structure: R-COO-R' (carboxylic acid + alcohol minus water). Named as alkyl alkanoate, e.g., ethyl ethanoate (ethyl acetate).

7. What functional group characterizes an ether, and give its general formula.

   Ether: an oxygen bonded to two carbon groups, R-O-R'. General formula CnH2n+2O for saturated ethers (isomeric with alcohols).

8. Define a nitrile and give its functional group.

   A nitrile contains the cyano group (-C#N), a carbon triple-bonded to nitrogen; general formula R-C#N. Named as alkanenitrile.

9. What distinguishes alkanes, alkenes, and alkynes?

   Alkanes: only C-C single bonds (CnH2n+2, saturated). Alkenes: at least one C=C double bond (CnH2n). Alkynes: at least one C#C triple bond (CnH2n-2).

10. What is a phenol and how does its acidity compare to that of aliphatic alcohols?

    A phenol has -OH attached directly to an aromatic (benzene) ring. Phenols are far more acidic than alcohols (pKa ~10 vs ~16-18) because the phenoxide ion is resonance-stabilized.

11. What is the functional group of an amide and how is it formed?

    Amide: carbonyl bonded to nitrogen (R-CO-NR'2). Formed by reaction of a carboxylic acid derivative with ammonia or an amine, releasing water (or HX/alcohol).

12. Define a thiol and state its functional group.

    A thiol (mercaptan) contains the sulfhydryl group (-SH); general formula R-SH. The sulfur analogue of alcohols.

13. What are acid anhydrides and how are they generally formed?

    Acid anhydrides have two acyl groups bonded to one oxygen (R-CO-O-CO-R'). Formed by removing water from two carboxylic acid molecules, e.g., acetic anhydride.

14. Define a haloalkane (alkyl halide) and give its general formula.

    A haloalkane has one or more halogen atoms replacing hydrogen on an alkane: R-X (X = F, Cl, Br, I); general formula CnH2n+1X for monohaloalkanes.

15. What is the general structure of an acid halide (acyl halide)?

    An acyl group bonded to a halogen: R-CO-X (most commonly acid chlorides, R-COCl); the most reactive carboxylic acid derivative.

16. What is an amino acid and what are its two characteristic functional groups?

    An amino acid is an organic molecule containing both an amino group (-NH2) and a carboxylic acid group (-COOH). In alpha-amino acids both are attached to the same (alpha) carbon.

17. What is the general structure of an alpha-amino acid?

    H2N-CHR-COOH: a central (alpha) carbon bearing an amino group, a carboxyl group, a hydrogen, and a variable side chain (R group) that defines the specific amino acid.

18. What is a zwitterion in the context of amino acids?

    A zwitterion is the dipolar, internally neutral form of an amino acid in which the carboxyl group is deprotonated (-COO-) and the amino group is protonated (-NH3+), the dominant form near physiological pH.

19. Define the isoelectric point (pI) of an amino acid.

    The pI is the pH at which the amino acid carries no net electrical charge (exists predominantly as the zwitterion) and does not migrate in an electric field.

20. How many standard amino acids are commonly found in proteins, and how many are essential in humans?

    There are 20 standard (proteinogenic) amino acids. In adult humans, 9 are essential (must be obtained from diet): histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

21. Why are 19 of the 20 standard amino acids optically active, and what configuration do they have?

    Their alpha carbon is a chiral center (four different groups), making them optically active. Naturally occurring amino acids have the L-configuration. Glycine is the exception (achiral, R = H).

22. Classify amino acids by side-chain polarity into the four main groups.

    (1) Nonpolar/hydrophobic, (2) polar uncharged, (3) acidic (negatively charged, e.g., Asp, Glu), and (4) basic (positively charged, e.g., Lys, Arg, His).

23. What is a peptide bond and which functional groups form it?

    A peptide bond is an amide linkage formed between the carboxyl group of one amino acid and the amino group of another, with loss of a water molecule (condensation).

24. Define the primary structure of a protein.

    The primary structure is the linear sequence of amino acids in the polypeptide chain, held together by covalent peptide bonds.

25. What are the two main types of secondary structure in proteins and what stabilizes them?

    Alpha-helix and beta-pleated sheet. Both are stabilized by hydrogen bonds between backbone carbonyl (C=O) and amide (N-H) groups.

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