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Question

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


A

C2H2

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B

C2H4

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C

C2H6

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D

C2H8

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Solution

The correct option is C

C2H6


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.


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