Which of the following is the least stable carbonium ion?
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a
C⊕F3
b
C⊕NO23
c
C⊕Cl3
d
C⊕CH33
answer is B.
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Detailed Solution
NO2 group is a strong –I group, which makes carbocation unstable. Al ready the carbocation is electron deficient and the nitro group pulls more electrons and makes it least stable.