Which of the following compounds will not exist as resonance hybrid? Give reason for your answer:

R - C O N H_{2}

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

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C H_{3} O H

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Solution

The correct option is C $C H_{3} O H$
In part (A) :

$C H_{3} O H$ will not exist as a resonance hybrid because it is not a conjugated system.

In part (B) :

In this molecule lone pair on nitrogen is in conjugation with π-bond. So, this compound will exist in resonance hybrid structure.

In part (C):

This compound is not a conjugated system as lone pair of nitrogen is not in conjugation with the $π$ -bond. So, it will not exist as a resonance hybrid.

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

So, the correct option is : (A) and (C).

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H_{3} P O_{3}

can be represented by structures 1 and 2 shown above. Can these two structures be taken as the canonical forms of the resonance hybrid representing

H_{3} P O_{3}

? If not, give reasons for the same.

$H_{3} P O_{3}$ can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing $H_{3} P O_{3}$ ? If not, give reasons for the same.

Q. Is air a mixture or a compound? Give three reasons for your answer.

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