Q.

The decreasing order of stability of the following cations isI)CH3CH2+ II)CH2=C+HIII)HC≡C+IV)CH3C+=O

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a

I > III > II > IV

b

III > IV > II > I

c

IV > I > II > III

d

II > I > III > IV

answer is C.

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Detailed Solution

→ Resonance stabilised carbocations are more stable than the nonresonance stabilised carbocation
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The decreasing order of stability of the following cations isI)CH3CH2+ II)CH2=C+HIII)HC≡C+IV)CH3C+=O