Question:
The correct order of increasing stabilities for the following carbocations is
(1) allyl carbocation
(2) neopentyl carbocation
(3) benzyl carbocation
(4) isobutyl carbocation
The correct order of increasing stabilities for the following carbocations is
(1) allyl carbocation
(2) neopentyl carbocation
(3) benzyl carbocation
(4) isobutyl carbocation
Updated On: Jun 8, 2024
- $ (1)
- $ (4)
- $ (2)
- $ (2) < \,(4) < \,(3) < \, (1) $
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The Correct Option is C
Solution and Explanation
Allyl carbocation (stabilised by resonance)
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Neopentyl carbocation :
Benzyl carbocation (stabilised by resonance)
Isobutyl carbocation :
Benzyl and allyl carbocations are much more stable due to resonance
Hence, the stability order is
Neopentyl carbocation $
undefinedundefinedundefinedNeopentyl carbocation :
Benzyl carbocation (stabilised by resonance)
Isobutyl carbocation :
Benzyl and allyl carbocations are much more stable due to resonance
Hence, the stability order is
Neopentyl carbocation $
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Concepts Used:
Hydrocarbons - Reaction Mechanism
Hydrocarbons are organic compounds that are entirely made up of only two kinds of atoms – carbon and hydrogen. Typically, hydrocarbons are colourless gases that have very weak odours.
Mechanism of electrophilic substitution reactions:
According to experimental evidences, SE (S = substitution; E = electrophilic) reactions are supposed to proceed via the following three steps:
- Generation of the electrophile
- Formation of carbocation intermediate
- Removal of proton from the carbocation interm