Question

The correct order of increasing bond length of $C-H$, $C-O$, $C-C$ and $C=C$ is :

• A. $C-H<C-O<C-C<C=C$
• B. $C-H<C=C<C-O<C-C$
• C. $C-C<C=C<C-O<C-H$
• D. $C-O<C-H<C-C<C=C$

Answer 1

The correct option is B $C-H<C=C<C-O<C-C$

The $C-H$ bond is the shortest due to the small size of both atoms & large electronegativity difference.

The double bonds are shorter than single bonds.

Hence $C=C<C-O$ and $C-C$

Due to electronegativity difference between $C$ and $O$

$C-O<C-C$

$\therefore$ Correct order of increasing bond length is :

$C-H<C=C<C-O<C-C$

Hence, the correct option is B.