Which is the correct decreasing order of stability? (i) CH3 - overset text+CH - CH3 (ii) CH3 - overset text+CH -O - CH3 (iii) CH3 overset text+CHCOCH3

Question

Which is the correct decreasing order of stability? (i) CH3 - overset text+CH - CH3 (ii) CH3 - overset text+CH -O - CH3 (iii) CH3 overset text+CHCOCH3 (A) (iii) > (ii) > (i) (B) (i) > (ii) > (iii) (C) (iii) > (i) > (iv) (D) (ii) > (iii) > (i)

Tardigrade Admin · Accepted Answer

Presence of -I effect in a carbocation decreases delocalisation of the positive charge and hence decreases stability of the carbocation and vice-versa. Thus, the carbocation (iii) having -COCH3 group is the least stable, followed by (ii) having -OCH3 group and followed by (i) having only alkyl group.

Q. Which is the correct decreasing order of stability? (i) CH3​−C+H−CH3​ (ii) CH3​−C+H−O−CH3​ (iii) CH3​C+HCOCH3​

(iii) > (ii) > (i)

(i) > (ii) > (iii)

(iii) > (i) > (iv)

(ii) > (iii) > (i)

Q. Which is the correct decreasing order of stability?
(i) $C H_{3} - C + H - C H_{3}$
(ii) $C H_{3} - C + H - O - C H_{3}$
(iii) $C H_{3} C + H COC H_{3}$