Which carbocation is most stable?

Question

Which carbocation is most stable? (A) CH 3 CH 2+ (B)  CH3+  (C) C 6 H 5 CH 2+ (D) CH 3 CH 2 CH 2+

Tardigrade Admin · Accepted Answer

A phenyl group, in which there is a flow of electron due to resonance of the benzene ring, generally causes -I effect, but truely speaking it can act as both electron donating as well as electron withdrawing groups, depending upon the nature of group with which it is attached. In C 6 H 5 CH 2+, phenyl group is attached to electron deficient group, hence it will donate electron due to resonance in benzene ring and thus stabilise the cation.

Q. Which carbocation is most stable?

$C H_{3} C H_{2}^{+}$

$C H_{3}^{+}$

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

$C H_{3} C H_{2} C H_{2}^{+}$

Q. Which carbocation is most stable?

CH3​CH2+​

CH3+​

C6​H5​CH2+​

CH3​CH2​CH2+​

$C H_{3} C H_{2}^{+}$

$C H_{3}^{+}$

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

$C H_{3} C H_{2} C H_{2}^{+}$