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Question

Consider the following carbocations.

(I) $$  C_6 H_5 \overset { + }{ C } H_2 $$

(II) $$  C_2 H_5 \overset { + }{ C } H_2 $$

(III) $$ C_6H_5\overset { + }{ C } H CH_3 $$

 (IV) $$ C_6H_5\overset { + }{ C } H(CH_3)_2 $$

 The correct sequence of the stability of these is


A
II < I < III < IV
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B
II < III < I < IV
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C
III < I < II < IV
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D
IV < III < II < I
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Solution

The correct option is C II < I < III < IV
The order of stability of the given compounds is:

$$  C_2 H_5 \overset { + }{ C } H_2 $$ $$< $$ $$  C_6 H_5 \overset { + }{ C } H_2 $$ $$<$$ $$$ C_6H_5\overset { + }{ C } H CH_3 $$ $$<$$ $$ C_6H_5\overset { + }{ C } H(CH_3)_2 $$

So, the order is II<II<III<IV

Hence, Option "A" is the correct answer. 

Chemistry

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