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Reactions of Alkyl Halides

Consider the ...

Question

Consider the following carbocations :
(I) $C_{6} H_{5} C H_{2}^{+}$
(II) $C_{6} H_{5} C H_{2} - C H_{2}^{+}$
(III) $C_{6} H_{5} - C H^{+} - C H_{3}$
(IV) $C_{6} H_{5} C^{+} (C H_{3})_{2}$
The correct sequence for the stability of these is:

II < I < III < IV

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II < III < I < IV

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III < I < II < IV

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IV < III < I < II

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Solution

The correct option is B II < I < III < IV
(I) The stability of $C_{6} H_{5} C H_{2}^{+}$ is due to resonance.
(II) The stability of $C_{6} H_{5} C H_{2} - C H_{2}^{+}$ is due to only inductive effect.
(III) The stability of $C_{6} H_{5} - C H^{+} - C H_{3}$ is due to resonance and $+ I$ effect of 1 methyl group.
(IV) The stability of $C_{6} H_{5} C^{+} (C H_{3})_{2}$ is due to both by resonance and $+ I$ effect of 2 methyl groups.
So, order of stability of carbocation is $I V > I I I > I > I I$ or $I I < I < I I I < I V$ .

Suggest Corrections

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C_{6} H_{5} + C H_{2}

C_{6} H_{5} C H_{2} + C H_{2}

C_{6} H_{5} C H C H_{3}

C_{6} H_{5} + C (C H_{3})_{2}

C l_{3} C^{+}

C l_{2} C H^{+}

C l C H_{2}^{+}

C H_{3}^{+}

C_{6} H_{5} \leftarrow C H_{2}

C_{6} H_{5} \leftarrow C H_{2} C H_{2}

C_{6} H_{5} \leftarrow C H \leftarrow C H_{3}

C_{6} H_{5} \leftarrow C (C H_{3})_{2}

C_{6} H_{5} \oplus C H_{2}

C_{6} H_{5} C H_{2} \oplus C H_{2}

C_{6} H_{5} \oplus C H C H_{3}

C_{6} H_{5} \oplus C (C H_{3})_{2}

^{\oplus} C H_{2} - C O C H_{3}

^{\oplus} C H_{2} - O C H_{3}

^{\oplus} C H_{2} - C H_{3}

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