Hyperconjugation is of three types-
1. σ (C–H), π conjugation
This type of conjugation occurs in alkenes and alkyl substituted aromatic compounds.
2. σ(C–H), positive charge(vacant p-orbital) conjugation
This type of conjugation occurs in alkyl carbocations.
3. σ(C–H), odd electron (incomplete p-orbital conjugation)
This type of conjugation occurs in alkyl free radicals.