Benzene is ______

Question

Question

This question was previously asked in

DSSSB PGT Chemistry (Female) Official Paper (Held On: 06 Jul, 2018 Shift 1)

Answer 1

CONCEPT:

Annulenes

Annulenes are monocyclic hydrocarbons with alternating single and double bonds in a conjugated system.
The general formula for annulenes is C_nH_n for even n and C_nH_n+1 for odd n.
The naming of annulenes is based on the number of carbon atoms in the ring, enclosed in brackets. For example:
- [6] Annulene: Contains 6 carbon atoms in the ring.
- [18] Annulene: Contains 18 carbon atoms in the ring.

EXPLANATION:

Benzene (C₆H₆) is a cyclic compound with six carbon atoms in a conjugated system of alternating single and double bonds.
In the context of annulenes, benzene fits the definition of [6] Annulene because it contains six carbon atoms in the ring.
The options provided are:
- Option 1: [16] Annulene (Incorrect, as benzene has only six carbon atoms.)
- Option 2: [3] Annulene (Incorrect, as benzene has more than three carbon atoms.)
- Option 3: [6] Annulene (Correct, as benzene has six carbon atoms.)
- Option 4: [18] Annulene (Incorrect, as benzene has fewer than eighteen carbon atoms.)

Therefore, the correct answer is Option 3: Benzene is [6] Annulene.