Question

Which of the following is true regarding hyperconjugation, also known as no-bond resonance?
(i) Like inductive effect it involves donation of electrons through s bonds
(ii) Hyperconjugation involves overlapping of filled orbitals with the empty p orbital of the carbocation
(iii) Like resonance, it involves displacement of p or lone pair of electrons to the carbon bearing positive charge
(iv) It involves delocalisation of s and p- electrons
(a) (ii) and (iv)
(b) (ii)
(c) (iii)
(d) none

Answer 1

I think b is correct. pls check ✔

Answer 2

Answer:

The hyperconjugation effect is a permanent effect that occurs when electrons of an alkyl group's C-H bond are directly connected to an unsaturated system atom or an atom with an unshared p orbital.

Explanation:

(i)  Like inductive effect it involves the donation of electrons through s bonds.

• This statement is incorrect because the inductive effect is based on the polarity of the bond or either an electron-withdrawing or electron-donating groups are attached to the compound.

(ii) Hyperconjugation involves the overlapping of filled orbitals with the empty p orbital of the carbocation.

• This statement is correct because of the overlapping of the filled orbitals containing sigma bonds. With the empty p-orbital of the carbocation takes place.

(iii) Like resonance, it involves displacement of p or lone pair of electrons to the carbon bearing a positive charge.

• This statement is incorrect because in hyperconjugation only the sigma bond can displace its electrons to the carbon bearing a positive charge.

(iv) It involves delocalization of s and p- electrons.

• It only involves the delocalization of s-electrons. This statement is also incorrect about hyperconjugation.

Therefore, the correct statement is (ii).

Hence, the correct option is (b) ii.

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