When C-H electrons are in conjugation with $\mathrm{\pi }$-bond this conjugation is known as hyper conjugation. For any compound to show hyper conjugation.
(i) composed should have one SP²-hybridised carbon
(ii) $\mathrm{\alpha }$-carbon with respect to SP² should be SP³
(iii) $\mathrm{\alpha }$-Carbon should contain at least one H atom and no. of alpha hydrogens $\mathrm{\alpha }$ stability of alkene.