Final answer:
A C–H bond in fluoroformaldehyde is formed between an sp2 hybrid orbital of carbon and the 1s orbital of hydrogen.
Step-by-step explanation:
The two orbitals involved in the formation of a C–H bond in fluoroformaldehyde are the sp2 hybrid orbital of carbon and the 1s orbital of hydrogen. The carbon atom undergoes sp2 hybridization, using one of the hybrid orbitals to form a sigma bond with hydrogen by overlapping with the hydrogen's 1s orbital. This type of bond is referred to as an sp2-s bond, as shown in the illustration where the hybridization process forms four equivalent sp3 hybrid orbitals, and each covalent bond is formed by the overlap of an sp3 orbital of carbon with an s orbital of hydrogen. However, in fluoroformaldehyde, the carbon is not sp3 hybridized but rather sp2 hybridized as it is involved in a double bond with oxygen.