The correct order of decreasing length of the | vedclass

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Question

(C) The bond length is inversely proportional to the double bond character. Resonance increases the double bond character, thereby decreasing the bond

Vedclass · Accepted Answer

$III > II > I$

Vedclass · Answer

(C) The bond length is inversely proportional to the double bond character. Resonance increases the double bond character, thereby decreasing the bond length.In structure $I$, the positive charge is in direct conjugation with the double bond, leading to significant double bond character.In structure $II$, the positive charge is also in conjugation, but the presence of two positive charges creates a different electronic environment compared to $I$.In structure $III$, the positive charge is separated from the double bond by a $CH_2$ group, so there is no resonance-induced double bond character.Therefore, the bond length follows the order: $III > II > I$.

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is:

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