Assertion(A): Aspirin is used to prevent heart attacks.
Reason(R): Aspirin prevents the clotting of blood.

Assertion (A): - $N{O}_2$ group is benzene ring deactivating and m - directing group

Reason (R): - $N{O}_2$ group with draws electron density from benzene ring and makes ortho and para positions more electron deficient than meta position

Assertion (A): Both aromatic and aliphatic primary amines produce stable diazonium salts on diazotization

Reason (R): Aromatic diazonium salt exhibit resonance

Assertion (A): In addition if HBr to propene, isopropyl bromide is major

product but n - propyl bromide is minor product

Reason(R): Isopropyl carbonium ion is more stable than n - propyl carbonium ion

Assertion (A): Sodium metal is stored in kerosene

Reason (R): The density of sodium is less than water