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Shortest C-C distance (1.20 Å) is in acetylene, as acetylene has sp hybridization. The bond length increases in the order:

1. C≡C sp(1.20Å)
2. C=C sp2(1.34Å)
3. C-C sp3(1.54Å)
4. C-C sp2(1.40Å)

Correct answer: C≡C sp(1.20Å)

Solution

The bond length decreases as the bond order increases. Acetylene (C≡C) has the shortest bond length (1.20 Å) due to the triple bond and sp hybridization, which results in maximum s-character and stronger bonding.

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