Q.

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.
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