Question 1

Which of the following best distinguishes a ketone from an aldehyde based on their structures?

Accepted Answer

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

Question 2

Which of the following compounds is correctly matched with its IUPAC name?

Accepted Answer

CH3CH2CHO – Propanal

Question 3

A chemist isolates a compound with the formula CH3COCH3. Which class of compound does this belong to, and what is its IUPAC name?

Accepted Answer

Ketone; Propanone

Question 4

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

Accepted Answer

The suffix '-al' is used in IUPAC names for aldehydes.

Question 5

A compound is named 2-methylpropanal in IUPAC nomenclature. What is its common name?

Accepted Answer

Isobutyraldehyde

Question 6

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

Accepted Answer

A carbonyl group bonded to a hydroxyl group

Question 7

A student is asked to name the compound CH3CH(CH3)CH2CHO. Which of the following is the correct IUPAC name?

Accepted Answer

2-Methylbutanal

Question 8

Which of the following is the correct common name for the compound with the formula CH3CH2CH2CHO?

Accepted Answer

Butyraldehyde

Question 9

In the context of biological systems, why are carbonyl compounds such as aldehydes and ketones considered important?

Accepted Answer

They are key intermediates in organic synthesis and metabolic pathways.

Question 10

A molecule is named 'formylcyclohexane' in a chemical reaction. What does the 'formyl-' prefix indicate about the structure?

Accepted Answer

A -CHO group is attached as a substituent to the cyclohexane ring.

Question 11

Which of the following best explains why the carbonyl carbon in aldehydes and ketones is electrophilic?

Accepted Answer

The oxygen atom is more electronegative than carbon, pulling electron density away from the carbonyl carbon.

Question 12

A compound is named 'acetone' in common nomenclature. What is its IUPAC name and class of compound?

Accepted Answer

Propanone; Ketone

Question 13

Which of the following is the correct IUPAC name for the compound with the formula HCHO?

Accepted Answer

Methanal

Question 14

A patient is exposed to formaldehyde in a laboratory accident. Which of the following statements about formaldehyde is correct?

Accepted Answer

It is the simplest aldehyde, with the formula HCHO.

Question 15

Which of the following best describes the difference in the general formulas of aldehydes and carboxylic acids?

Accepted Answer

Aldehydes: R-CHO; Carboxylic acids: R-COOH

Question 16

A chemist is synthesizing a compound with the prefix 'butyr-' in its common name. How many carbon atoms does the parent chain contain?

Accepted Answer

Four

Question 17

Which of the following is a correct statement about the use of Greek letters in common names of carbonyl compounds?

Accepted Answer

Greek letters indicate the position of substituents relative to the carbonyl group.

Question 18

A student is given a compound with the formula CH3CH2COOH. Which class of compound does this belong to, and what is its general structure?

Accepted Answer

Carboxylic acid; R-COOH

Question 19

Which of the following best explains why carboxylic acids are more acidic than alcohols?

Accepted Answer

The carboxylate ion formed after deprotonation is stabilized by resonance.

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

Study Guide - Practice Questions