How many of the following species are stabilised by hyperconjugation of $C - H$ bond :
(i) $CH_{3} CH_{2}^{-}$ (ii) $CH_{3} CH_{2}^{+}$ (iii) $Me_{3} C - CH_{2}^{+}$
(iv) $Me_{3} C^{∙}$ (v) $Ph - CH_{2}^{+}$ (vi) $(Me_{3} C)_{2} CH^{*}$
(vii) $: CH_{2}$ (viii) Benzene (ix) Propylene
(x) Acetylene

Question

How many of the following species are stabilised by hyperconjugation of $C - H$ bond :

(i) $CH_{3} CH_{2}^{-}$ (ii) $CH_{3} CH_{2}^{+}$ (iii) $Me_{3} C - CH_{2}^{+}$

(iv) $Me_{3} C^{∙}$ (v) $Ph - CH_{2}^{+}$ (vi) $(Me_{3} C)_{2} CH^{*}$

(vii) $: CH_{2}$ (viii) Benzene (ix) Propylene

(x) Acetylene

TestHub · Accepted Answer

Hyperconjugation stabilizes carbocations, free radicals, and alkenes via $σ$ -p or $σ$ - $π$ orbital overlap.

Species stabilized by hyperconjugation: (ii) $CH_{3} CH_{2}^{+}$ , (iv) $Me_{3} C^{∙}$ , (ix) Propylene.

Chemistry - GOC Question with Solution | TestHub