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Question
A tertiary carbocation is more stable than the seondary carbocation because of which one of the following?
A tertiary carbocation is more stable than the seondary carbocation because of which one of the following?
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Solution
The correct option is D (a) and (c) above.
When an electron-releasing or an electron-withdrawing species is introduced to a chain of atoms (generally a carbon chain), the corresponding negative or positive charge is relayed through the carbon chain by the atoms belonging to it. This causes a permanent dipole to arise in the molecule and is referred to as the inductive effect.
Hyperconjugation effect is a permanent effect in which localization of σ electrons of C-H bond of an alkyl group directly attached to an atom of the unsaturated system or to an atom with an unshared p orbital takes place.
More the number of hyperconjugation, more is the stability.
Tertiary carbocations with 9α−H are more stable due to hyperconjugation & more +I effect by 3 −CH3 groups. .
Hence, (d) is the correct option.
When an electron-releasing or an electron-withdrawing species is introduced to a chain of atoms (generally a carbon chain), the corresponding negative or positive charge is relayed through the carbon chain by the atoms belonging to it. This causes a permanent dipole to arise in the molecule and is referred to as the inductive effect.
Hyperconjugation effect is a permanent effect in which localization of σ electrons of C-H bond of an alkyl group directly attached to an atom of the unsaturated system or to an atom with an unshared p orbital takes place.
More the number of hyperconjugation, more is the stability.
Tertiary carbocations with 9α−H are more stable due to hyperconjugation & more +I effect by 3 −CH3 groups. .
Hence, (d) is the correct option.
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