Question

Which of the following has the weakest carbon-carbon bond strength?

• A. $C_2{H}_4$
• B. $C_2{H}_2$
• C. $C_2{H}_6$
• D. $C_2{H}_8$

Answer 1

The correct option is C

$C_2{H}_6$

As the number of shared electrons increases, the bond strength increases.
In a triple bond, totally 6 electrons are shared. In a double bond, totally 4 electrons are shared and in a single bond, only 2 electrons are shared. Thus, the bond strength is as follows:
Triple bond > double bond > single bond. Therefore, C₂H₆ has weakest carbon-carbon bond strength because it is an alkane with carbon-catbon single bonds.