Q.8 Which is the most stable carbocation among the following +CH³ CH3-CH²
(CH³)²CH (CH³)³C+
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Explanation:
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Class 11
>>Chemistry
>>Organic Chemistry - Some Basic Principles and Techniques
>>Fundamental Concepts in Organic Reaction Mechanism
>>Which of the following carbocation is mo
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Which of the following carbocation is most stable?
(a)(CH
3
)
3
C−CH
2
+
(b) (CH
3
)
3
C
+
(c) CH
3
CH
2
CH
2
+
(d) CH
3
CH
+
CH
2
CH
3
Medium
Solution
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The hyperconjugation involves the delocalisation of sigma electrons to the empty p orbital present at the alpha position as shown in the above image.
Hence, there is need of a sigma C−H bond of the sp
3
hybridized carbon atom which is present at alpha position with respect to the carbocation.
More the number of sigma C−H bonds at alpha position, more the number of hyperconjugating structures and more the stability. Hence structure (b) which is having nine sigma C−H bonds will be the most stable carbocation.
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