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In which of the following, will resonanc...

In which of the following, will resonance be possible?

A

`CH_(2)=CH-CH_(2)-CHO`

B

`CH_(2)=CH-CH=O`

C

`CH_(3)COCH_(3)`

D

`CH_(2)=CH-CH_(2)-CH=CH_(2)`

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The correct Answer is:
B
Resonance is possible on account of conjugation:
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In which of the following resonance will be possible? (A) CH_(3)-CH_(2)-CH_(2)-CHO (B) CH_(2)=CH-CH=O (C) CH_(3)COCH_(3) (D) CH_(2)=CH-CH_(2)-CH=CH_(2)

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