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Introduction to Alkenes

There is barr...

Question

There is barrier to rotation about $C_{2} - C_{3}$ bond in $1, 3$ - butadiene.
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Solution

In 1, 3- butadiene, rotation about $C_{2} - C_{3}$ bond is not free as in case of butane. The restriction to rotation arises due to delocalization of pi electrons. Due to the above delocalization, $C_{2} - C_{3}$ bond acquire same partial double bond character and free rotation is prevented.

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