Single Choice

Arrange the following resonanting structures of formic acid on order of decreasing stability.

AII $$>$$ I $$>$$ III $$>$$ IV
BI $$>$$ III $$>$$ II $$>$$ IV
Correct Answer
CIII $$>$$ II $$>$$ IV $$>$$ I
DIV $$>$$ III $$>$$ I $$>$$ II

Solution

Stability of resonating structures depends on the following-
Number of π bonds ∝ Resonance energy ∝ stability.
Contributing structures should be such that the negative charge resides on an electronegative element and positive charge resides on an electropositive element.
In contributing structures, like charges should not reside on atoms close to each other and unlike charges should be widely separated.

Hence the correct order for the resonating structure is-
I>III>II>IV

SIMILAR QUESTIONS

Chemical Bonding

Which of the following statement is NOT correct?

Chemical Bonding

Which of the following is not a feature of resonance?

Chemical Bonding

Which of the following is the correct statement regarding urea?

Chemical Bonding

Explain why each of the following are not resonance forms: $$H_{2}\ddot{N} - O - H $$ and $$H_{2} \ddot{N} = \overset{+}{O} - H $$

Chemical Bonding

State True or False. The reason for resonance is delocalisation of $$\pi$$ -electrons.

Chemical Bonding

The resonating structures of cyanate ion are, $$\underset{(i)}{O=C=N^-}$$ $$\leftrightarrow$$ $$\underset{(ii)}{^-O-C\equiv N}$$ $$\leftrightarrow$$ $$\underset{(iii)}{^+O\equiv C-N^{2-}}$$ The correct set of oxidation states of O, C and N respectively with the most stable structure out of the above is?

Chemical Bonding

Arrange the following resonating structures of vinyl chloride in order of decreasing stability.

Chemical Bonding

The correct decreasing order of stability of I, II and III carbocations is?

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