Which formula represents a saturated hydrocarbon?

1. C₄H₈
2. C₅H₁₂
3. C₄H₆
4. C₅H₁₀

The metal whose oxide can be reduced by common reducing agents:

1. Copper
2. Sodium
3. Aluminium
4. Potassium

In the reaction given below sulphuric acid acts as a/an:

S + 2H₂SO₄ ⟶ 3SO₂ + 2H₂O

1. Non-volatile acid
2. Dibasic acid
3. Oxidising agent
4. Reducing agent

Assertion (A): The tendency of losing electrons increases down the Group.

Reason (R): The most reactive metal is placed at the top of Group 1.

1. Both (A) and (R) are true, and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, and (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.