Which one of the following reagents can distinguish aldehydes and ketones?

Which of the followig reagents are used to distinguish aldehydes from ketones ? (I) Fehling's reagent (II) Lucas reagent (III) Hinsberg's reagent (IV) Tollens reagent

Which one of the following gives on ozonolysis both aldehyde and ketone :

Which one of the following reagents can be used to distinguish between chlorocyclohexane and chlorobenzene-

Write a test to distinguish between aldehydes and ketones.