Which carbenium ion is least stable?

(C H_{3})_{3} C + C H_{2}

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(C H_{3})_{2} + C C H_{2} C H_{3}

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(C H_{3})_{2} C H + C H C H_{3}

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C H_{3} C H_{2} + C H C H_{2} C H_{3}

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Solution

The correct option is D $(C H_{3})_{3} C + C H_{2}$
Primary carbocation is least stable than secondary and tertiary carbocation as it has less electron donating alkyl groups attached to it .So option A has the primary carbocation so it is least stable when compared to the given options.
Hence option A is correct.

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Similar questions

Q. Rank the following intermediates according to the stability (most stable first) :

C H_{3} C H_{2} C H_{2} \oplus C H_{2}, C H_{3} \oplus C H C H_{2} C H_{3}, (C H_{3})_{2} \oplus C C H_{2} C H_{3}, (C H_{3})_{3} \oplus C

The arrangement of $(C H_{3})_{3} C -, (C H_{3})_{2} C H -, C H_{3} C H_{2} -$ When attached to a benzene or an unsaturated group in increasing order of inductive effect is:

Q. The stability of carbocations follows the order.

(C H_{3})_{3} C^{\oplus}

II.

(C H_{3})_{2} \oplus C (O C H_{3})

III.

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

IV.

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

The correct order of stability of the following carbanions is:

$(C H_{3})_{3} C^{-},^{-} C C l_{3}, (C H_{3})_{2} C H^{-}, C_{6} H_{5} - C H_{2}^{-}$

W h i c h o f f o l l o w i n g r e p r e s e n t β - h y d r o x y b u t y r a t e - c o - β - h y d r o x y v a l a r a t e ?

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Which carbenium ion is least stable?

The correct option is D (CH3)3C+CH2Primary carbocation is least stable than secondary and tertiary carbocation as it has less electron donating alkyl groups attached to it .So option A has the primary carbocation so it is least stable when compared to the given options.Hence option A is correct.