Assertion (A): Carbon monoxide will not produce an acid when made to react with water?

Reason (R): Carbon monoxide is a neutral oxide.

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.

Both A and R are true and R is the correct explanation of A.

Reason — Carbon monoxide (CO) is classified as a neutral oxide; it does not react with either acids or bases and, consequently, does not form an acidic or basic solution in water. Under ordinary conditions there is no reaction:

CO + H₂O ⟶ no acid formed

Therefore the assertion (A) is true, and the reason (R) correctly explains why CO fails to produce an acid with water.