Which of the following are true statements ?

Question

a) A free radical is a molecule with no unpaired electrons

b) Molecules in the atmosphere can gain energy equal to hv by absorbing a photon.

c) Chemical reactions that do not occur at normal atmospheric temperatures can take place by absorbing a photon

d) O2(g) → O + O is an example of photodissociation

Answer 1

a) is false. Free radicals have an unpaired electron.

The others are all true.