Consider the following carbocations:1)C6H5C+H2 2) C6H5CH2C+H23)C6H5C+HCH3 4) C6H5C+H(CH3)2The correct sequence of the stabilities is :

compound reasonC6H5C+H2resonanceC6H5CH2C+H2no resonanceC6H5C+HCH3resonance and hyperconjugation(3α-H atoms)C6H5C+H(CH3)2resonance and hyperconjugation(6α-H atoms)As the number of resonance structures increases stability of benzyl carbocations increases.

Consider the following carbocations:1)C6H5C+H2 2) C6H5CH2C+H23)C6H5C+HCH3 4) C6H5C+H(CH3)2The correct sequence of the stabilities is :

compound reasonC6H5C+H2resonanceC6H5CH2C+H2no resonanceC6H5C+HCH3resonance and hyperconjugation(3α-H atoms)C6H5C+H(CH3)2resonance and hyperconjugation(6α-H atoms)As the number of resonance structures increases stability of benzyl carbocations increases.

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Consider the following carbocations:
1) $C_{6} H_{5} \overset{+}{C} H_{2}$ 2) $C_{6} H_{5} {CH}_{2} \overset{+}{C} H_{2}$
3) $C_{6} H_{5} \overset{+}{C} {HCH}_{3}$ 4) $C_{6} H_{5} \overset{+}{C} H {({CH}_{3})}_{2}$
The correct sequence of the stabilities is :

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IV > III > II > I

I > II > III > IV

II > I > III > IV

IV > III > I > II

answer is D.

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Detailed Solution

compound	reason
$C_{6} H_{5} \overset{+}{C} H_{2}$	resonance
$C_{6} H_{5} {CH}_{2} \overset{+}{C} H_{2}$	no resonance
$C_{6} H_{5} \overset{+}{C} {HCH}_{3}$	resonance and hyperconjugation(3 $α$ -H atoms)
$C_{6} H_{5} \overset{+}{C} H {({CH}_{3})}_{2}$	resonance and hyperconjugation(6 $α$ -H atoms)