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Which of the following compounds will no...

Which of the following compounds will not exist as resonance hybrid. Give reason for your answer.
(a) `CH_(3)OH`
(b) `R - CONH_(2)`
(c) `CH_(3) CH = CHCH_(2)NH_(2)`

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(i) `CH_3 OH` : It does not contain `pi`-electrons and therefore, cannot exist as resonance hybrid.
(ii) `CH_3 CH = CH CH_2 NH_2` does not contain lone pair of electrons on the N atom in conjugation with then `pi` - electrons of the double bond. Therefore, resonance is not possible.
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