For each of the following organic molecules draw a Lewis structure in which the carbon atoms are

Question:

For each of the following organic molecules draw a Lewis structure in which the carbon atoms are bonded to each other by single bonds:
(a) C2H6,
(b) C4H10,
(c) C5H12.
For (b) and (c), show only structures in which each C atom is bonded to no more than two other C atoms.