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NEET levelSingle correct optionDifficulty 1 of 3hc095

Which of the following is a conjugated diene?

Ahexa-1,5-diene, $CH X_{2} = CH - CH X_{2} CH X_{2} - CH = CH X_{2}$
Bpenta-1,3-diene, $CH X_{2} = CH - CH = CH - CH X_{3}$
Cpenta-1,2-diene, $CH X_{2} = C = CH - CH X_{2} CH X_{3}$
Dpenta-1,4-diene, $CH X_{2} = CH - CH X_{2} - CH = CH X_{2}$

Answer: B

A conjugated diene has two double bonds separated by exactly one single bond. Penta-1,3-diene fits this. Penta-1,4-diene and hexa-1,5-diene are isolated dienes, and penta-1,2-diene has cumulated double bonds.

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