Which of the following compounds will not exist as resonance hybrid ?

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$C H_{3} - C H = C H - N H_{2}$

$C H_{3} O H$

${CH}_{3} COOH$

$R C O N H_{2}$

answer is A.

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Detailed Solution

CH₃OH will not exist as a resonance hybrid because it is not a conjugated system.
${RCONH}_{2}$ In this molecule lone pair on nitrogen is in conjugation with π-bond. So, this compound will exist in resonance hybrid structure.
${CH}_{3} COOH$ In this molecule the negative charge and the electron move between the two oxygen atoms present in the structure so this compound will exist in resonance hybrid structure.
$C H_{3} - C H = C H - N H_{2}$ In this molecule Lone pair of nitrogen and double bond participitation. So it exist in resonance hybrid structure.

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