Which of the following carbocation is most stable?
\((CH_3)_3C.C^+H_2\)
\((CH_3)_3C^+\)
\(CH_3CH_2C^+H_2\)
\(CH_3C^+H CH_2CH\)
The Correct Option is B
Solution and Explanation
\((CH_3)_3C^+\) 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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Concepts Used:
Organic Chemistry – Some Basic Principles and Techniques - Reaction Mechanism
SN1 Reaction Mechanism:
SN1 reaction mechanism takes place by following three steps –
- Formation of carbocation
- Attack of nucleophile
- Deprotonation
SN2 Reaction Mechanism:
The SN2 reaction mechanism involves the nucleophilic substitution reaction of the leaving group (which generally consists of halide groups or other electron-withdrawing groups) with a nucleophile in a given organic compound.
Electrophilic Aromatic Substitution Reaction Mechanism:
The mechanism of an electrophilic aromatic substitution reaction contains three main components which are:
- A new sigma bond from C=C is formed during the reaction in the arene nucleophile.
- Due to the breaking of the C-H sigma bond, a proton is removed.
- The C=C bond is reformed and it restores the aromaticity of the compound.
Electrophilic Substitution Reaction Mechanism:
The electrophilic substitution reaction mechanism is composed of three steps, which will be discussed more below.
- Electrophile Generation
- Carbocation Formation
- Proton Removal