Amines are derivatives of the molecule.
aldehyde
ammonia
acetone
nitric acid

ammonia

Explanation:- Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.

1. Aldydes have functional group .

Example: Ethanal with molecular formula

2. Amines have functional group .

Example: Methylamine with molecular formula . they are formed by substituting one hydrogen of ammonia by a R substituent.

3. Ketones have functional group .

Example: Acetone with molecular formula

4. Nitric acid is a inorganic acid with molecular formula .

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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answer; talc and gypsum;