APCE Organic Chemistry & Biochemistry

Question 1

What is the general formula for an alkane?

Accepted Answer

CₙH₂ₙ₊₄.

Answer

The general formula for an alkane is CnH2n+2, where 'n' represents the number of carbon atoms. This formula describes saturated hydrocarbons containing only single carbon-carbon and carbon-hydrogen bonds, ensuring that each carbon atom forms four bonds. The provided option C, CnH2n+4, is not the standard general formula for alkanes.

Question 2

What is the functional group of alcohols?

Accepted Answer

Answer

The functional group characteristic of alcohols is the hydroxyl group, represented as -OH. This group consists of an oxygen atom covalently bonded to a hydrogen atom, and it is attached to a carbon atom within an organic molecule. The presence of the hydroxyl group dictates many of the chemical and physical properties of alcohols.

Question 3

What type of reaction is involved in the conversion of an alkene to an alkane?

Accepted Answer

Hydrogenation.

Answer

The conversion of an alkene to an alkane involves a hydrogenation reaction. In this process, hydrogen gas (H₂) is added across the carbon-carbon double bond of the alkene, typically in the presence of a metal catalyst like platinum, palladium, or nickel. This addition reaction saturates the hydrocarbon, transforming the alkene into a single-bonded alkane.

Question 4

What is a peptide bond?

Accepted Answer

A bond between the carboxyl group of one amino acid and the amino group of another amino acid.

Answer

A peptide bond is a covalent bond formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH₂) of another amino acid. This bond is formed through a condensation reaction, where a molecule of water is removed. Peptide bonds are fundamental to linking amino acids together to form polypeptide chains and ultimately proteins.

Question 5

What is the primary function of enzymes in biochemical reactions?

Accepted Answer

To catalyze reactions and increase the reaction rate.

Answer

Enzymes are biological catalysts that significantly increase the rate of biochemical reactions without being consumed in the process. They achieve this by lowering the activation energy required for the reaction to proceed. Each enzyme is highly specific, typically catalyzing only one or a few related reactions.

AP Practice Test

AP Practice Test

APCE Organic Chemistry & Biochemistry