Carbocation stability is primarily determined by inductive effect and hyperconjugation. Alkyl groups are electron-donating, which stabilizes the positive charge on carbon. More alkyl groups mean more electron donation and greater stability. Hyperconjugation, the delocalization of electrons from adjacent sigma bonds into the empty p-orbital of the carbocation, further enhances stability. The number of alpha-hydrogens (hydrogens on carbons adjacent to the carbocation) directly correlates with the extent of hyperconjugation.
In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below - Assertion (A): The relative stability of carbocation is - (CH₃)₃C⁺ > (CH₃)₂CH⁺ > CH₃CH₂⁺ > CH₃⁺ Reason (R): Greater the number of alkyl groups attached to positively charged carbon, more will be hyperconjugation, higher will be stability. (1) (A) is correct, (R) is incorrect. (2) (A) and (R) both are correct and (R) is not the correct explanation of (A). (3) (A) and (R) both are incorrect. (4) (A) and (R) both are correct and (R) is the correct explanation of (A).
Asked in Department Recruitment 2024 (Chemist) 2024 · Topic: Organic Chemistry (Fundamental Principles of Organic Chemistry: Bonding, hybridisation, resonance, inductive effect, hyperconjugation, acidity, and basicity.)
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Answer: D. (4) (A) and (R) both are correct and (R) is the correct explanation of (A).
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