Question

Identify secondary amines from the following list?
a) N,N-Dimethylethanamine
b) N-Methylmethanamine
c) 4-Bromobenzenamine
d) N-Methylbenzenamine
e) N-Methylethanamine

• A. b, d and e
• B. a and c
• C. Only a
• D. Only c

Hint:

A secondary amine has two carbon groups attached to nitrogen and one hydrogen on it.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Amines are classified by the number of alkyl or aryl groups on the nitrogen atom. A secondary amine has two such groups, written as \(\text{R}_2\text{NH}\).

Step 2: Classify each compound
a) N,N-dimethylethanamine has three groups on N, so it is tertiary. b) N-methylmethanamine, \(\text{CH}_3\text{NHCH}_3\), is secondary. c) 4-bromobenzenamine is a primary arylamine.

Step 3: Continue
d) N-methylbenzenamine, \(\text{C}_6\text{H}_5\text{NHCH}_3\), is secondary. e) N-methylethanamine, \(\text{CH}_3\text{NHC}_2\text{H}_5\), is secondary.

Step 4: Compare the options
The secondary amines are b, d and e.

Final Answer:
The secondary amines are b, d and e. \[ \boxed{\text{(A) }\text{b, d and e}} \]