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Standard XII

Chemistry

Hyperconjugation

Which is the ...

Question

Which is the least stable carbocation?

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

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H_{3} C^{+}

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

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

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Solution

The correct option is B $H_{3} C^{+}$
$Stability of carbocation \propto Number of α -H$
$H_{3} C^{+}$ is the least stable carbocation because it has no $α$ -H.

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Similar questions

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. Rank the transition states that occur during the following reaction steps in order of increasing stability (least

\to

most stable)
1.

H_{3} C - + O H_{2} \to C H_{3}^{+} + H_{2} O

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

(C H_{3})_{2} C - + O H_{2} \to (C H_{3})_{2} C H^{+} + H_{2} O

IUPAC name of this compound

C H_{3} C H_{2} - H_{3} C | C | C H_{2} C H_{2} C H_{3} - C_{2} H_{5} | C H - C_{2} H_{5}

Q. Most stable carbocation formed from

{(C H_{3})}_{3} C - B r, {(C_{6} H_{5})}_{3} C B r, {(C_{6} H_{5})}_{2} C H B r

and

C_{6} H_{5} C H_{2} B r

would be:

Q. Which is expected to be more stable, (I)

O_{2} N C H_{2} C H_{2} O^{-}

or (II)

C H_{3} C H_{2} O^{-}

and why?

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Hyperconjugation

Standard XII Chemistry

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Which is the least stable carbocation?

The correct option is B H3C+Stability of carbocation∝Number of α-H H3C+ is the least stable carbocation because it has no α-H.

The correct option is B $H_{3} C^{+}$
$Stability of carbocation \propto Number of α -H$
$H_{3} C^{+}$ is the least stable carbocation because it has no $α$ -H.