Question

The bond angle of central oxygen atom in simple acid anhydride is:

• A. $sp$
• B. $s{p}^2$
• C. $s{p}^3$
• D. none of these

Answer 1

The correct option is B $s{p}^2$

The bond angle of central oxygen atom in simple acid anhydride ( $(R-\underset{\underset{O}{||}}{C}{)}_2-O$) is $s{p}^2$. This is because, the lone pair of electrons on central oxygen atom is involved in resonance with carbonyl group which imparts double bond character.

Note:

The double bond to central atom is characteristic of $s{p}^2$ hybridisation.