Question

How many primary amines are possible for the formula C$_4$H$_{11}$N?

• A. 4
• B. 3
• C. 2
• D. 5

Hint:

Count structural isomers carefully — position of –NH$_2$ and branching matters.

Answer 1

The Correct Option is A

Step 1: General approach.
Primary amines have –NH$_2$ group attached to an alkyl chain. We need to find all possible structural isomers for C$_4$H$_{11}$N.
Step 2: Possible structures.
1. n-Butylamine: CH$_3$–CH$_2$–CH$_2$–CH$_2$–NH$_2$
2. sec-Butylamine: CH$_3$–CH(NH$_2$)–CH$_2$–CH$_3$
3. Isobutylamine: (CH$_3$)$_2$CH–CH$_2$–NH$_2$
4. tert-Butylamine: (CH$_3$)$_3$C–NH$_2$
Step 3: Conclude.
Total = 4 primary amines. Final Answer: \[ \boxed{4} \] % Quciktip