Question

The correct sequence of bond length in a single bond, a double bond and triple bond of $C$ is:

• A. $(C-C)=(C=C)=(C\equiv C)$
• B. $C\equiv C<C=C<C-C$
• C. $C-C<C=C<C\equiv C$
• D. $C=C<C\equiv C<C-C$

Answer 1

Answer: (B)

$C\equiv C<C=C<C-C$

The bond length changes with the bond order like this:-

$Bondlength\alpha \frac{1}{Bondorder}\alpha \frac{1}{No.ofbonds}$

As the number of bonds will increase, the bond order will increase and the bond length will decrease.

So, the correct option is $B$

$C\equiv C<C=C<C-C$