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Which of the following carbocation is le...

Which of the following carbocation is least stable?

A

`C_6 H_5 - overset(+) CH_2`

B

`p - NO_2 - C_6 H_4 - overset(+) CH_2`

C

`p - CH_3 - O - C_6 H_4 - overset(+) CH_2`

D

`p - Cl - C_6 H_4 - overset(+) CH_2`

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BRILLIANT PUBLICATION-ORGANIC CHEMISTRY: BASIC PRINCIPLES - PART II (REACTION MECHANISM)-LEVEL -II
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  7. The stability order of the following carbocations is

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  12. Addition of HCN to carbonyl compounds is

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