Decreasing order of stability of given carbocations is? (1) (2) textCH2 = textCH - overset⊕ textC textH2 (3) textC6 textH5 - overset⊕ textC textH2 (4) textCH3 - overset⊕ textC textH - textCH3

Question

Decreasing order of stability of given carbocations is? (1) <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/c-71eafkikqbwdomzw.jpg" /> (2) textCH2 = textCH - overset⊕ textC textH2 (3) textC6 textH5 - overset⊕ textC textH2 (4) textCH3 - overset⊕ textC textH - textCH3 (A) 3 > 2 > 4 > 1 (B) 1 > 3 > 4 > 2 (C) 1 > 3 >2 > 4 (D) 3 > 2 > 1 > 4

Tardigrade Admin · Accepted Answer

The factors affecting carbocation stability:
1. If carbocation is on more percentage s character carbon, it will be less stable.
2. If carbocation is attached to any electron donating group (groups those show positive inductive, mesomeric and hyperconjugation effect), its stability increases.
3. If carbocation is busy in aromatic stability, it will still be more stable than any other factor.
Preference of effects:
Aromaticity > resonance > mesomeric > hyperconjugation > inductive
(1) Solution

Aromatic
(2)

CH_{2} = CH - C \oplus H_{2}

(2 Resonating Structure)

(3) Solution

Positive charge is more delocalised (4 Resonating Structure)
(4)

CH_{3} - C \oplus H - CH_{3}

(6 hyper conjugation)

Aromatic (2) textCH2 = textCH - overset⊕ textC textH2 (2 Resonating Structure) (3) Solution

Positive charge is more delocalised (4 Resonating Structure) (4) textCH3 - overset⊕ textC textH - textCH3 (6 hyper conjugation)

Q. Decreasing order of stability of given carbocations is? (1) (2) CH2​=CH−C⊕H2​ (3) C6​H5​−C⊕H2​ (4) CH3​−C⊕H−CH3​

3 > 2 > 4 > 1

1 > 3 > 4 > 2

1 > 3 >2 > 4

3 > 2 > 1 > 4

Q. Decreasing order of stability of given carbocations is?

(1) (2) $CH_{2} = CH - C \oplus H_{2}$

(3) $C_{6} H_{5} - C \oplus H_{2}$ (4) $CH_{3} - C \oplus H - CH_{3}$