Question

Conjugated double bond is present in:

• A. 1, 2-butadiene
• B. 1, 3-butadiene
• C. 1, 3-pentadiene
• D. $\beta -butylene$

Answer 1

Answer: (B), (C)

The correct options are
B 1, 3-butadiene
C 1, 3-pentadiene

$A)H_{2}C=C=C-C{H}_3$ $1,2-butadience$

$B)H_{2}C=\stackrel{H}{\stackrel{|}{C}}-\underset{H}{\underset{|}{C}}-C{H}_2$ $1,3-butadience$

$C)H_{2}C=\underset{H}{\underset{|}{C}}-HC=CH-C{H}_3$ $1,3-pentadience$

$D)$ Refer image.

Conjugated double bond means single and double bonds alternate.