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(C) Let us analyze each option:$A$. Bond length of $C=O$ depends on the extent of resonance. More resonance means more single bond character,hence hig

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(C) Let us analyze each option:$A$. Bond length of $C=O$ depends on the extent of resonance. More resonance means more single bond character,hence higher bond length. Cyclohexanone has no resonance,while the others have increasing conjugation,so the order is incorrect.$B$. Resonance energy is higher for more conjugated systems. The second molecule is a cross-conjugated system,which is generally less stable than the extended conjugated system in the first molecule. Thus,the order is incorrect.$C$. The stability of carbocations is governed by resonance and aromaticity. The pyrylium ion is aromatic and highly stable,followed by resonance-stabilized allylic cations. This order is correct.$D$. Dipole moment increases with the contribution of polar resonance structures that achieve aromaticity. Cyclohepta$-2,4,6-$trienone (tropone) has a highly polar aromatic resonance structure,making it have a very high dipole moment. The order is correct.

Choose the correct order $:-$

Similar Questions

Identify the $-I$ effect causing group from the following.

In the following resonance structures,the curved arrow indicates that electrons are shifted from:

Which of the following is the strongest $-I$ (inductive effect) group?

Identify the type of electromeric effect ($E$-effect) in the following reactions:
$(a) >C=C< + CN^{-} \to -C(CN)-C^{-}-$
$(b) >C=C< + H^{+} \to -C^{+}-CH-$

Determine the correct order of stability for the following carbocations:

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