Question

The molecule that contains only $s{p}^2$ hybrid carbon atoms is

• A. isoprene
• B. acrylonitrile
• C. but-1-ene
• D. 1, 3-butadiene
• E. isobutene

Answer 1

Answer: (D)

Double bonded carbon atoms are sp ${}^2$ hybridised. The structures of the given compounds are as

(a)

isoprene

(b)

acrylonitrile

(c)

but-1-ene

(d)

1,3-butadiene

(e)

iso-butene

Thus, $1,3$-butadiene contains only $s{p}^2$ hybridised carbon atoms.