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Q. The molecule that contains only $sp^2$ hybrid carbon atoms is

KEAMKEAM 2012Organic Chemistry – Some Basic Principles and Techniques

Solution:

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

(a) image

isoprene

(b) image

acrylonitrile

(c) image

but-1-ene

(d) image

1,3-butadiene

(e) image

iso-butene

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