Question

Which among the following compounds is NOT a carbocyclic compound?

• A. Benzene
• B. Naphthalene
• C. Pyridine
• D. Cyclopentane

Hint:

"Carbo-" means carbon, and "-cyclic" means ring. If any element other than carbon (like the nitrogen atom in Pyridine) is built directly inside the ring loop, it immediately shifts out of carbocyclic into heterocyclic!

Answer 1

The Correct Option is C

Step 1: Define carbocyclic.
A carbocyclic ring is made of only carbon atoms. If any other atom sits in the ring, it is heterocyclic.

Step 2: Check each.
Benzene, naphthalene, and cyclopentane have rings of pure carbon. Pyridine has a nitrogen inside the ring.

Step 3: Pick.
Pyridine is the heterocyclic one, so it is not carbocyclic.
\[ \boxed{\text{Pyridine, option 3}} \]