Identify the molecules which have $s p$-hybridised carbon(s) from the lisst given under. I. Ethane nitrile, II. Buta-1, 3-diene, III. Propan-1,2-diene, IV. Ethyne V. Benzene

• A

  I, II, III only
• B

  II, III, IV only
• C

  III, IV, V only
• Correct answer
  D

  I, III, IV only

Solution

( ) $s p$-hybridised carbon must have two $\pi$-bonds. The following molecules have atleast one carbon that possess $2 \pi$-bonds.
However, given below none of the carbon atom in the molecules have $2 \pi$-bonds, so none of them is $s p$-hybridised.

Hence, the correct answer is option: 'D'.