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In which of the following lone-pair indi...

In which of the following lone-pair indicated is not involved in resonance:

A

`CH_(2)=CH-CH=underset(..)overset(..)(O)`

B

`CH_(2)=CH-underset(..)overset(..)(O)-CH=CH_(2)`

C

`CH_(2)=CH-C-=N:`

D

Text Solution

Verified by Experts

The correct Answer is:
A, C, D

(B). A double bonded oxygen will not releases electron density. So its I.p. will not involve in resonance.
(D). `CH_(2)=CH-C-=overset(..)(N)`
Carbon having only four valencies
(E). Not a conjugates system.
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