Hyperconjugation involves delocalisation of ___________.
(i) electrons of carbon-hydrogen σ bond of an alkyl group directly attached
to an atom of the unsaturated system.
(ii) electrons of carbon-hydrogen σ bond of alkyl group directly attached to
the positively charged carbon atom.
(iii) π-electrons of carbon-carbon bond
(iv) lone pair of electrons
Option (i) and (ii) are the answers.