Consider the following carbocations, stability of carbocations increasing order (I) (C)6( H )5 overset+ C ( H )2 (II) (C)6( H )5( CH )2 overset+C ( H )2 (III) (C)6( H )5 overset+ C ( HCH )3 (IV) (C)6( H )5 overset+ C (( CH )3)2

Question

Consider the following carbocations, stability of carbocations increasing order (I) (C)6( H )5 overset+ C ( H )2 (II) (C)6( H )5( CH )2 overset+C ( H )2 (III) (C)6( H )5 overset+ C ( HCH )3 (IV) (C)6( H )5 overset+ C (( CH )3)2 (A) (II) < (I) < (III) < (IV) (B) (I) < (II) < (III) < (IV) (C) (III) < (II) < (I) < (IV) (D) (IV) < (I) < (III) < (I)

Tardigrade Admin · Accepted Answer

Resonance and inductive effect decide stability of carbocations. <img class="img-fluid question-image" alt="Solution" src="https://cdn.tardigrade.in/q/nta/c-bixgoajypovw.png" /> ∴ Correct order of stability is (II) < (I) < (III) < (IV)

Q. Consider the following carbocations, stability of carbocations increasing order
(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) $(C)_{6} (H)_{5} C + ((C H)_{3})_{2}$

(II) < (I) < (III) < (IV)

(I) < (II) < (III) < (IV)

(III) < (II) < (I) < (IV)

(IV) < (I) < (III) < (I)

Resonance and inductive effect decide stability of carbocations.

∴ Correct order of stability is

(II) < (I) < (III) < (IV)

Q. Consider the following carbocations, stability of carbocations increasing order (I) (C)6​(H)5​C+(H)2​ (II) (C)6​(H)5​(CH)2​C+(H)2​ (III) (C)6​(H)5​C+(HCH)3​ (IV) (C)6​(H)5​C+((CH)3​)2​