Question

Conjugated double bonds are present of these in:

• A. 1, 3-butadiene
• B. butylene
• C. isobutylene
• D. propylene

Answer 1

Answer: (A)

1, 3-butadiene

Answer 2

One double bond one single bond sequence in a carbon chain is called conjugated system. Hence, conjugated double bonds are present in 1, 3-butadiene. $\underset{\text{1,}\,\,\text{3-butadiene}}{\mathop{C{{H}_{2}}==CH--CH==C{{H}_{2}}}}\,$