Step-by-step explanation:
Atomic number of carbon is 6 and its electronic distribution is 2, 4. This means that there are 4 valence electrons present in a carbon atom. Hence, in order to complete its octet it needs to gain 4 more electrons.
Whereas atomic number of hydrogen atom is 1. As in the given molecule there are only two carbon atoms. So, both of them will chemically combine together by sharing of one electron.
Hence, each carbon atom will be attached to three carbon atoms. In total there will be six hydrogen atoms.
Hence, the molecule will be
.