Question

Propranolol is

• A. 1-(1-methylpropylamino)-3-(1-naphthyloxy)propan-2-ol
• B. 1-(1-methylethylamino)-3-(1-naphthyloxy) propan-2-ol
• C. 1-(ethylamino)-3-(1-naphthyloxy)-2-ol
• D. 1-(propylamino)-3-(1-naphthyloxy)propan-2-ol

Hint:

Propranolol has a Naphthyl ring and an Isopropyl amine group.

Answer 1

The Correct Option is B

Step 1: Concept
Propranolol is a non-selective beta-blocker used for heart conditions and anxiety.

Step 2: Meaning
Its chemical name is derived from the naphthyloxy group and the isopropylamino side chain.

Step 3: Analysis
The structure consists of a naphthalene ring linked to a propan-2-ol chain, which is further substituted with an isopropyl group (1-methylethyl) on the amine.

Step 4: Conclusion
Option B accurately reflects the IUPAC-style name including the "1-methylethylamino" (isopropyl) substituent.

Final Answer: (B)