Question

Double bonds (=) are:

• A. bond length may be longer or may be shorter depending on electron pull
• B. shorter than single bonds
• C. bond length is same of single or double
• D. longer than single bonds

Answer 1

The correct option is B shorter than single bonds

Alkenes with general formula of $C_n{H}_{2n}$ is a unsaturated compound with double bond. Alkene have one single and one double bond. This double bond is stronger than a single bond and due to increased $s$ character it is also shorter than single bond with bond length of $0.134A^o$