Single Choice

The correct stability order of the following resonance structures is: $$\underset{(I)}{H_2C=\overset{+}{N}=\overset{-}{N}}$$ $$\underset{(II)}{H_2\overset{+}{C}-N=\overset{-}{N}}$$ $$\underset{(III)}{H_2\overset{-}{C}-\overset{+}{N}\equiv N}$$ $$\underset{(IV)}{H_2\overset{-}{C}-N=\overset{+}{N}}$$

A$$(I) > (II) > (IV) > (III)$$
B$$(I) > (III) > (II) > (IV)$$
Correct Answer
C$$(II) > (I) > (III) > (IV)$$
D$$(III) > (I) > (IV) > (II)$$

Solution

The resonating structure is more stable if it requires lesser charge separation and the more electronegative atom carries negative charge.

So, the correct stability order of the given resonance structures is $$(I) > (III) > (II) > (IV)$$.

Hence, Option "B" is the correct answer.

SIMILAR QUESTIONS

Organic Chemistry

Resonance in benzene is accompanied by delocalization of $$\pi$$ electrons. Each $$\pi$$ electron is attached with

Organic Chemistry

In benzene, all the C- C bonds have the same length because of_________.

Organic Chemistry

Which of the following functional group shows $$+R$$ effect?

Organic Chemistry

The correct order of stability for the given alkoxides is :

Organic Chemistry

The "N" which does not contribute to the basicity for the compound is :

Organic Chemistry

Which of the following group is sharp ortho and para directive?

Organic Chemistry

The order of leaving group ability is : i. $$-OAc$$ ii. $$-OMe$$ iii. $$-OSO_4Me$$ iv. $$-OSO_2CF_3$$

Organic Chemistry

Among the following, the least stable resonance structure is :

Organic Chemistry

Which of the following have +M effect ($$\bar { e }$$-donating mesomeric effect) ?

Organic Chemistry

Which one of the following groups can exert both $$+ M$$ and $$- I$$ effect?

Contact Details