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Question

Rate of dehydration of the following in increasing order is:
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  1. I<II<III<IV
  2. II<III<IV<I
  3. I<III<IV<II
  4. none of these

A
II<III<IV<I
B
I<III<IV<II
C
none of these
D
I<II<III<IV
Solution
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Dehydration is the removal of water while having deprotonation from the adjacent carbon atom.

In the (IV) structure dehydration lead to formation of stable benzene and dehydration of (III) structure will have 2 alternate double in the ring which are in resonance.

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