Question

Resonance occurs due to

• A. delocalisation of $\pi$-electrons
• B. delocalisation of $\sigma$-electrons
• C. delocalisation of lone pair
• D. (a) and (c) above.

Answer 1

The correct option is D (a) and (c) above.

Resonance occurs due to delocalisation of π electrons and lone pair electrons. It is a phenomenon in which two or more structures involving identical positions of atoms, can be written for a particular compound. So, option(d) is the correct answer.