Carbonyl compound is treated with--- in Clemmensen reduction .

1.  Zinc amalgam + HCl

2.  Sodium amalgam + HCl

3. Zinc amalgam + nitric acid

4.  Sodium amalgam + HNO3

Hint: Aldehyde or ketone is convert into hydrocarbon

Clemmensen reduction is used to convert carbonyl group to CH2 group as follows:

Zinc amalgam and HCI act as reagent in this reaction.