The partial Lewis structure that follows is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies the octet rule, and there are no unshared electron pairs in the molecule. The carbon-carbon bonds are labeled 1, 2, and 3.
(a) Determine where the hydrogen atoms are in the molecule.
(b) Rank the carbon-carbon bonds in order of increasing bond length.
(c) Rank the carbon-carbon bonds in order of increasing bond enthalpy

:C- C=C-C=C