Question 1

Which of the following best describes the structural difference between an aldehyde and a ketone?

Accepted Answer

An aldehyde has a carbonyl group bonded to at least one hydrogen atom, while a ketone has the carbonyl group bonded to two carbon atoms.

Question 2

A hospital laboratory receives a sample labeled as 'acetone.' What is the IUPAC name for this compound, and what is its general formula?

Accepted Answer

Propanone; CH3COCH3

Question 3

Which of the following compounds is correctly matched with its IUPAC and common names?

Accepted Answer

CH3CH2CHO: Propanal (IUPAC), Propionaldehyde (common)

Question 4

A chemist is naming a compound with the formula CH3CH(CH3)CH2CHO. What is its IUPAC name?

Accepted Answer

2-Methylbutanal

Question 5

Which prefix is used in the common naming system for a six-carbon aldehyde?

Accepted Answer

Capro-

Question 6

A molecule is named 'formylcyclohexane.' What functional group does it contain, and what is the role of 'formyl-' in this name?

Accepted Answer

It contains an aldehyde group as a substituent; 'formyl-' indicates the presence of a -CHO group attached to cyclohexane.

Question 7

Which of the following best explains why the IUPAC name for HCHO is 'methanal'?

Accepted Answer

The molecule has one carbon atom and an aldehyde group, so the root 'meth-' and the suffix '-al' are used.

Question 8

A student is asked to name the compound (CH3)2CHCHO. Which of the following is correct?

Accepted Answer

Common name: Isobutyraldehyde; IUPAC name: 2-Methylpropanal

Question 9

Which of the following statements about the nomenclature of ketones is correct?

Accepted Answer

The suffix '-one' is used in IUPAC names, and the prefixes 'keto-' or 'oxo-' are used when the carbonyl group is a substituent.

Question 10

A pharmaceutical company is developing a new drug with the structure CH3CH2COCH3. What is the IUPAC name of this compound?

Accepted Answer

Butan-2-one

Question 11

Which of the following best describes the functional group present in carboxylic acids?

Accepted Answer

A carbonyl group bonded to a hydroxyl group (-COOH)

Question 12

A compound is named '2-methylpropanal.' Which of the following is its correct structural formula?

Accepted Answer

(CH3)2CHCHO

Question 13

Which of the following is the correct IUPAC name for the compound commonly known as 'valeraldehyde'?

Accepted Answer

Pentanal

Question 14

A forensic chemist finds a sample with the formula CH3CH2CH2CH2CHO. What is the common name for this compound?

Accepted Answer

Valeraldehyde

Question 15

Which of the following best explains why the carbonyl group is considered a key functional group in organic chemistry?

Accepted Answer

It is highly reactive and forms the basis for many important classes of compounds, including aldehydes, ketones, and carboxylic acids.

Question 16

A student is asked to provide the prefix used when a ketone group is a substituent. Which of the following is correct?

Accepted Answer

keto- or oxo-

Question 17

Which of the following compounds contains a carbonyl group bonded to two carbon atoms?

Accepted Answer

Ketone

Question 18

A food scientist is analyzing a flavor compound with the formula CH3CH2CHO. What is the correct IUPAC name and common name for this compound?

Accepted Answer

IUPAC: Propanal; Common: Propionaldehyde

Question 19

Which of the following best describes the difference in suffixes used for naming aldehydes, ketones, and carboxylic acids in IUPAC nomenclature?

Accepted Answer

Aldehydes: -al; Ketones: -one; Carboxylic acids: -oic acid

Aldehydes, Ketones, and Carboxylic Acids: Structure, Nomenclature, and Common Names

Study Guide - Practice Questions