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Rank the following in order ofdecreasing...

Rank the following in order ofdecreasing rate in an `E_2` reaction :

A

A) `a gt b gt c`

B

B) `c gt a gt b`

C

C) `c gt b gt a`

D

D) `b gt a gt c`

Text Solution

Verified by Experts

The correct Answer is:
B
In `E_2` anti-elimination take place, H and bromine must be anti to each other (c) is most favourable because both hydrogen are anti to bromine most favourable for `E_2` reaction. (b) is least reactive because hydrogen and bromine both are on same side. (b) is inert toward `E_2` reaction.
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