The most stable carbonium ion is (a) (CH3)2 CH^+ (b) CH3 CH2^+ (c) (CH3)3 C-CH2^+ (d) (CH3)3 C^+

Name: Problem 41, Chapter 24: A Complete Resource Book in Chemistry for JEE Main 2019
Uploaded: 2021-07-04T08:38:01-08:00
Duration: 1 min 41 s
Channel: Raghvendra Singh
Description: The most stable carbonium ion is (a) (CH3)2 CH^+ (b) CH3 CH2^+ (c) (CH3)3 C-CH2^+ (d) (CH3)3 C^+

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The most stable carbonium ion is (a) (CH3)2 CH^+ (b) CH3...

The most stable carbonium ion is
(a) $\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{+}$
(b) $\mathrm{CH}_3 \mathrm{CH}_2^{+}$
(c) $\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{CH}_2^{+}$
(d) $\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{+}$

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Key Concepts

Degree of Alkyl Substitution

The stability of a carbocation is largely determined by the number of alkyl groups attached to the positively charged carbon. Tertiary carbocations, where the charged carbon is bonded to three other carbon atoms, are usually more stable than secondary or primary carbocations because the additional alkyl groups provide extra electron density through both inductive effects and hyperconjugation.

Hyperconjugation

Hyperconjugation is a stabilizing interaction that involves the delocalization of electrons from adjacent C-H bonds (sigma bonds) into the empty p orbital of the carbocation. This delocalization spreads out the positive charge over several atoms and significantly enhances the ion's stability.

Carbocation Stability

Carbocation stability refers to the factors that influence the persistence of a positively charged carbon center. Stability is increased by the ability of the surrounding groups to donate electron density to the deficient carbon atom, thereby lowering the overall energy of the ion.

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