Given below are two statements: 
Assertion (A): Sulphur present in an organic compound can be estimated quantitatively by the Carius method.
Reason (R): Sulphur is separated easily from other atoms in the molecule and gets precipitated as a light yellow solid.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.

Hint: Sulphur present in an organic compound can be estimated quantitatively by the Carius method
Sulphur present in an organic compound can be estimated quantitatively by the Carius method. In this method, a known
weight of the organic compound is heated with fuming HNO3, S present in it gets converted into H2SO4. On adding BaCl2,
H2SO4 gets precipitated as BaSO4 which may be of light yellow or white in colour.
If light yellow colour is obtained, it means some impurities are present. It is then filtered, washed, purified and then dried
and finally, pure BaSO4 of the white colour is obtained.
Thus, both assertion and reason are true and the reason is the correct explanation of assertion.