General Organic ChemistryMedium
Question
The most stable carbocation among the following is :
Options
A.
B.
C.
D.
Solution
Sol. [Key Concept: Hyperconjugation and carbocation stability]
Among the structures shown, option (2) is a tertiary carbocation and is the most stable in the standard alkyl carbocation comparison. The numbers of adjacent C–H bonds available for hyperconjugation are 1, 7, 3 and 5 for options (1), (2), (3) and (4), respectively. Thus the expected order is (2) > (4) > (3) > (1), supporting option (2).
(1) 
(2) 
(3) 
(4) 
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