Recall: ↑ bond order, ↑ bond energy, ↓ bond length
Drawing the Lewis structures of each:
H3CCH3 : C-C bond order: 1
Order these compounds in order of decreasing carbon-carbon bond length.
a) H2CCH2 > H3CCH3 > HCCH
b) H3CCH3 > H2CCH2 > HCCH
c) HCCH > H2CCH2 > HC3CH3
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