AP Chemistry: Organic Chemistry & Biochemistry 2 — Questions and Answers
Question 1: Which type of reaction converts an alkene into an alkane?
- Hydrogenation (Correct answer)
- Dehydration
- Halogenation
- Substitution
Correct answer: Hydrogenation
Hydrogenation adds H2 across the double bond, saturating the alkene into an alkane.
Question 2: What is the IUPAC name of CH3-CH2-OH?
- Methanol
- Ethanol (Correct answer)
- Propanol
- Ethanal
Correct answer: Ethanol
A two-carbon chain with a hydroxyl group is ethanol.
Question 3: Which functional group characterizes a carboxylic acid?
- -OH
- -CHO
- -COOH (Correct answer)
- -NH2
Correct answer: -COOH
The -COOH group, combining a carbonyl and hydroxyl, defines carboxylic acids.
Question 4: What kind of isomers have the same molecular formula but different connectivity?
- Stereoisomers
- Structural isomers (Correct answer)
- Enantiomers
- Conformers
Correct answer: Structural isomers
Structural (constitutional) isomers differ in how atoms are bonded.
Question 5: Which reagent is commonly used to oxidize a primary alcohol to a carboxylic acid?
- NaBH4
- KMnO4 (Correct answer)
- LiAlH4
- H2/Pd
Correct answer: KMnO4
Strong oxidizers like KMnO4 convert primary alcohols all the way to carboxylic acids.
Question 6: The bond between two amino acids in a protein is called a:
- Glycosidic bond
- Peptide bond (Correct answer)
- Phosphodiester bond
- Ester bond
Correct answer: Peptide bond
Amino acids link via peptide (amide) bonds formed in condensation reactions.
Question 7: Which hybridization describes the carbon atoms in benzene?
- sp
- sp2 (Correct answer)
- sp3
- sp3d
Correct answer: sp2
Benzene carbons are sp2 hybridized, giving a planar ring with delocalized pi electrons.
AP Chemistry: Organic Chemistry & Biochemistry 2
Which type of reaction converts an alkene into an alkane?