Organic Chemistry Quiz

Grade 12 · Science · Quiz

Test your mastery of organic compounds, reaction types, and functional group identification.

Questions

1. What is the IUPAC name for CH3-CH2-CH2-OH?

   1. Ethanol
   2. Propan-1-ol
   3. Butanol
   4. Methanol
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   Answer: Propan-1-ol

   Propan-1-ol is a 3-carbon chain (propan-) with a hydroxyl group on carbon 1 (-1-ol); ethanol has only 2 carbons.

2. In an SN1 reaction, the rate-determining step involves:

   1. Simultaneous attack by nucleophile and departure of leaving group
   2. Formation of a carbocation intermediate
   3. Formation of a carbanion intermediate
   4. Concerted backside attack
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   Answer: Formation of a carbocation intermediate

   SN1 proceeds in two steps: first, the leaving group departs to form a planar carbocation (rate-determining); then the nucleophile attacks.

3. Which statement best describes Markovnikov's rule?

   1. The halogen adds to the carbon with fewer hydrogens
   2. The hydrogen adds to the carbon already bearing more hydrogens
   3. Addition reactions always produce racemic mixtures
   4. Halogens add only to terminal carbons
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   Answer: The hydrogen adds to the carbon already bearing more hydrogens

   Markovnikov's rule states that in electrophilic addition to an asymmetric alkene, H adds to the carbon that already has more H atoms, forming the more stable carbocation.

4. Which reagent is commonly used to oxidize a primary alcohol to a carboxylic acid?

   1. NaBH4
   2. KMnO4
   3. HBr
   4. H2SO4 (catalyst only)
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   Answer: KMnO4

   Potassium permanganate (KMnO4) is a strong oxidizing agent capable of taking a primary alcohol all the way to a carboxylic acid.

5. Nylon is an example of which class of polymer?

   1. Polyester
   2. Polyamide
   3. Polyalkene
   4. Polycarbonate
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   Answer: Polyamide

   Nylon is a polyamide — its monomers are linked by amide (-CONH-) bonds formed between diamine and diacid monomers.

6. The reaction of an alcohol with a carboxylic acid to form an ester is called:

   1. Hydrolysis
   2. Fischer esterification
   3. Saponification
   4. Aldol condensation
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   Answer: Fischer esterification

   Fischer esterification is the acid-catalyzed condensation of a carboxylic acid and alcohol, producing an ester and water.

7. All chiral molecules must contain at least one carbon atom bonded to four different groups.

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   Answer: True

   A stereocenter (chiral center) requires four different substituents on a carbon; this non-symmetry is what makes the molecule and its mirror image non-superimposable.

8. The general formula for an alkyne is CnH___.

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   Answer: 2n-2

   Alkynes have the formula CnH(2n-2) due to the triple bond consuming two additional hydrogen atoms compared to the alkane formula CnH(2n+2).

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