Select the most stable carbonium ion:
Correct answer: D. (CH3)3C+
- A. +CH3
- B. +CH3CH₂
- C. (CH3)2 +CH
- D. (CH3)3C+
Explanation
Option D represents a tertiary carbonium ion, which is much more stable than primary or secondary carbonium ions.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Nucleophilic Substitution
Nucleophilic substitution replaces a leaving group in an alkyl halide when an electron-rich nucleophile attacks the carbon atom. The topic compares SN1 and SN2 mechanisms, including reaction conditions, substrate structure, solvent effects, nucleophile strength, carbocation formation and stereochemical changes, and distinguishes substitution from elimination.
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