The correct statement(s) pertaining to the following reactions is(are):

Options

1. AThe reaction in which the product has the same number of carbon atom as that in the reactant is II.
2. BThe reactions in which optically active reactant gives optically active product are III and IV.
3. CThe reaction in which one of the products has one carbon atom less than the reactant is I.
4. DThe reaction in which the product has one carbon atom more than the reactant is III.