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  4. The correct order of stability of following carbocation is (I) (II) (III) (IV) <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/4734f6d4119350d55ecd836b49c978d7-.png />

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Q. The correct order of stability of following carbocation is (I)
(II)
(III)
(IV) imageChemistry Question ImageChemistry Question ImageChemistry Question Image

Chhattisgarh PMTChhattisgarh PMT 2006

Solution:

Aromatic or aryl ring provides more stable carbonium ion, while aliphatic alkyi groups provides less stability due to +1 effect of alkyl group. Generally stability of carbonium ion decreases in the following order. Triphenyl methyl carbonium > diphenyl methyl carbonium > benzyl carbonium > allyl carbonium > tertiary carbonium > secondary carbonium > primary carbonium > ethyl carbonium.