Easy
Explain the delocalization of electrons in $CH_3-CH_2^+$ and $CH_3-CH=CH_2$.
(N/A) In $CH_3-CH_2^+$,the $\sigma$-orbital of the $C-H$ bond of the $CH_3$ group and the vacant $2p$-orbital of the $CH_2^+$ group are parallel,which allows for the delocalization of $\sigma$-electrons into the vacant $p$-orbital (hyperconjugation).
In $CH_3-CH=CH_2$,the $\sigma$-orbital of the $C-H$ bond of the $CH_3$ group and the $2p$-orbitals of the $\pi$-bond of the $CH=CH_2$ group are parallel,allowing for the delocalization of $\sigma$-electrons into the $\pi$-system (hyperconjugation).
In $CH_3-CH=CH_2$,the $\sigma$-orbital of the $C-H$ bond of the $CH_3$ group and the $2p$-orbitals of the $\pi$-bond of the $CH=CH_2$ group are parallel,allowing for the delocalization of $\sigma$-electrons into the $\pi$-system (hyperconjugation).
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Similar Questions
The most stable carbocation among the following is:
Match List-$I$ with List-$II$:
| List-$I$ (Mechanism steps) | List-$II$ (Effect) |
| :--- | :--- |
| $(A)$ Aniline resonance structure | $(I)$ $-E$ effect |
| $(B)$ Electrophilic addition of $H^+$ to alkene | $(II)$ $-R$ effect |
| $(C)$ Nucleophilic addition of $CN^-$ to alkene | $(III)$ $+E$ effect |
| $(D)$ Nitrobenzene resonance structure | $(IV)$ $+R$ effect |
Choose the correct answer from the options given below:
| List-$I$ (Mechanism steps) | List-$II$ (Effect) |
| :--- | :--- |
| $(A)$ Aniline resonance structure | $(I)$ $-E$ effect |
| $(B)$ Electrophilic addition of $H^+$ to alkene | $(II)$ $-R$ effect |
| $(C)$ Nucleophilic addition of $CN^-$ to alkene | $(III)$ $+E$ effect |
| $(D)$ Nitrobenzene resonance structure | $(IV)$ $+R$ effect |
Choose the correct answer from the options given below:
Which of the following is not explained by hyperconjugation?
The correct order of stability for the following alkoxides is:
$(A)$ $CH_3CH(NO_2)O^-$
$(B)$ $CH_2=C(NO_2)O^-$
$(C)$ $O_2N-CH=CH-O^-$
$(A)$ $CH_3CH(NO_2)O^-$
$(B)$ $CH_2=C(NO_2)O^-$
$(C)$ $O_2N-CH=CH-O^-$
The cyclic cations having the same number of hyperconjugation are: Choose the correct answer from the options given below:
DifficultJEE MAIN 2026
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