Which one of the following molecules has sp3 hybridization?

Explanation

Option A, CH4 has sp3 hybridization which enables all four bonds to be of the same length and strength. Option B, C2H4 has sp2 hybridization as carbon atom contains three single bonds which include sp2 orbitals, whereas the C-C double bond is brought about by a p-p overlap. Options, C and D, both have sp hybridization. In CO2, carbon has two single bonds which involve sp orbitals, and a double bond with each oxygen so, two free p orbitals are used for the two double bonds. In C2H2, an alkyne, carbon has two single bonds which involve sp orbitals, but a triple bond that uses two p orbitals per carbon atom.