The formulas for ethane, ethene, and ethyne are c 2 h 6 c2h6 , c 2 h 4 c2h4 , and c 2 h 2 c2h2 , respectively. rank these compounds by the length of the carbon–carbon bond.

Ethane (1.09 A) > Ethene(1.076 A) > Ethyne(1.06 A)

Explanation:

The types of bonds present are:

a) Ethane : single bond

b) Ethene : double bond (one sigma one pi)

c) Ethyne: triple bond (one sigma and two pi bonds)

More the number of bonds lesser the bond length.

Thus the order of bond length of carbon-carbon bond will be:

Ethane (1.09 A) > Ethene(1.076 A) > Ethyne(1.06 A)