List the following carbocations in order of d | vedclass

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(B) The stability of carbocations is primarily determined by hyperconjugation (number of $\alpha$-hydrogens) and resonance effects.$I$: This is a viny

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$III, IV, II, I$

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(B) The stability of carbocations is primarily determined by hyperconjugation (number of $\alpha$-hydrogens) and resonance effects.$I$: This is a vinyl carbocation,which is highly unstable due to the $sp$ hybridization of the positively charged carbon,making it the least stable.$II$: This is a secondary $(2^{\circ})$ carbocation with $4 \ \alpha$-hydrogens (from the adjacent $CH_2$ groups).$III$: This is a tertiary $(3^{\circ})$ carbocation with a methyl group,having $7 \ \alpha$-hydrogens ($3$ from the methyl group and $4$ from the ring).$IV$: This is a secondary $(2^{\circ})$ carbocation with $1 \ \alpha$-hydrogen.Comparing the number of $\alpha$-hydrogens:$III$ $(7 \ \alpha-H)$ > $II$ $(4 \ \alpha-H)$ > $IV$ $(1 \ \alpha-H)$ > $I$ (Vinyl cation).Thus,the order of decreasing stability is $III > II > IV > I$.

List the following carbocations in order of decreasing stability.

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