Question

Which molecule has the least C-C distance?
(A) C₂H₆
(B) C₂H₄
(C) C₂H₂
(D) C₄H₈

Answer 1

We know, single bond is longer than a double bond which is in turn longer than a triple bond.

Thus the least C-C distance would be in a molecule with a triple bond between C, thus the probable answer seems to be C2H2.

Hope this helps, inform if wrong, mark as brainliest if satified.