Question

The IUPAC name of CH$_3$–CH(NH$_2$)–CH$_3$ is:

• A. Propyl amine
• B. Isopropyl amine
• C. Propan-2-amine
• D. Propan-1-amine

Hint:

In naming amines, always use lowest locant for –NH$_2$ group and parent hydrocarbon chain.

Answer 1

The Correct Option is C

Step 1: Identify the parent chain.
The longest carbon chain = 3 carbons \(\Rightarrow\) propane.
Step 2: Locate substituent.
The –NH$_2$ group is attached to the 2nd carbon.
Step 3: Apply IUPAC rule.
Thus, the correct IUPAC name = Propan-2-amine.
Step 4: Check options.
- (A) Propyl amine: common name.
- (B) Isopropyl amine: common name, not IUPAC.
- (C) Propan-2-amine: Correct IUPAC.
- (D) Propan-1-amine: Wrong carbon position.