Question

Identify secondary amine from following.

• A. Phenylmethanamine
• B. N-Methylethanamine
• C. N, N-Dimethylethanamine
• D. Prop-2-en-1-amine

Hint:

Check how many alkyl/aryl groups are attached to the Nitrogen atom: 1 = Primary, 2 = Secondary, 3 = Tertiary.

Answer 1

The Correct Option is B

Step 1: Classification of Amines
- Primary ($1^\circ$): $-NH_2$
- Secondary ($2^\circ$): $-NH-$ 
- Tertiary ($3^\circ$): $-N<$ 
Step 2: Structure Analysis
- (A) Phenylmethanamine: $C_6H_5CH_2NH_2$ ($1^\circ$) 
- (B) N-Methylethanamine: $CH_3-NH-C_2H_5$ ($2^\circ$) 
- (C) N,N-Dimethylethanamine: $(CH_3)_2N-C_2H_5$ ($3^\circ$) 
- (D) Prop-2-en-1-amine: $CH_2=CHCH_2NH_2$ ($1^\circ$) 
Step 3: Conclusion
N-Methylethanamine is a secondary amine. 
Final Answer:(B)