Question

which of the following carbon - carbon bonds has the shortest bond length?
a) c - c single bond
b) c = c double bond
c) c ≡ c triple bond
d) c - c bond in ethane (c₂h₆)

Explanation:

Step1: Analyze bond length data

From the given data:

• \(C - C\) (single bond): \(147\ pm\)
• \(C = C\) (double bond): \(134\ pm\)
• \(C\equiv C\) (triple bond): \(120\ pm\)
• \(C - C\) in ethane (\(C_2H_6\)) is a single bond (\(C - C\)), so its bond length is \(147\ pm\) (same as \(C - C\) single bond in general).

Step2: Compare bond lengths

Comparing the values \(120\ pm<134\ pm < 147\ pm\)

Answer:

C. \(C\equiv C\) triple bond