Which of the following is least stable :-

C H_{3} - \oplus C H - C H_{3}

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C H_{3} - C H_{2} - \oplus C H_{2}

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C H_{3} - \oplus C | C H_{3} - C H_{3}

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C H_{3} - C H_{3} | C | C H_{3} - \oplus C H - C_{6} H_{5}

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Solution

The correct option is B $C H_{3} - C H_{2} - \oplus C H_{2}$
Depending on alpha-hydrogens , the compound with least number of alpha have is least stable. option D has no alpha hydrogens but the carbocation is stabilised by resonance.Therefore answer is B

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Similar questions

{CH}_{3} - {CH}_{2} - CH = {CH}_{3}

C H_{3} - C H_{2} - C H_{2} - C H_{2} - C H | C H_{3} - C | C H_{3} - C H_{3} - C H_{2} - C H_{3} | C H - C H_{2} - C H_{2} - C H_{2} - C H_{3}

{C H}_{3} - C H = {C H}_{2}

{C H}_{3} - C H = C H - {C H}_{3}

{C H}_{3} - C_{3} = C H - {C H}_{3}

{C H}_{3} - {C H}_{3} | C = {C H}_{3} | C - {C H}_{3}

C H_{3} - C H_{3}, C H_{2} = C H_{2}

C H \equiv C H

$C H_{3} - C | C H_{2} - C H_{3} = C H - C H_{2} - C H_{2} - C H_{3}$

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