Which of the following carbocation is most stable?

(a) (b) (c)

(d)

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Solution

is a tertiary carbocation. A tertiary carbocation is the most stable carbocation due to the electron releasing effect of three methyl groups. An increased + I effect by three methyl groups stabilizes the positive charge on the carbocation.

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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

Q. Which of the following carbocation is most stable?

(a)

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

(b)

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

(c)

C H_{3} C H_{2} C H_{2}^{+}

(d)

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

Which of the following carbocation is most stable?
(a) $(C H_{3})_{3} C . + C H_{2}$ (b) $(C H_{3})_{3} + C$
(c) $C H_{3} C H_{2} + C H_{2}$ (d) $C H_{3} + C H C H_{2} C H_{3}$

Q. Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds?

1. C H_{3} - C \equiv C - C H_{3}

2. C H_{3} - C H_{2} - C H_{2} - C H_{3}

3. C H_{3} - C H_{2} C \equiv C H

4. C H_{3} - C H = C H_{2}

Q. Identity the most stable cation in the following set of ions giving reason :

C H_{3} + C H_{2}

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

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Which of the following carbocation is most stable? (a) (b) (c) (d)

is a tertiary carbocation. A tertiary carbocation is the most stable carbocation due to the electron releasing effect of three methyl groups. An increased + I effect by three methyl groups stabilizes the positive charge on the carbocation.

Which of the following carbocation is most stable?

(a) (b) (c)

(d)