Chlorine

The correct answer is D:Dehydrating agent
A dehydrating agent is a chemical substance that eliminates water from other substances. However, is not considered a dehydrating agent because it does not absorb water molecules from other substances.

Step 1: Chlorine and hydrogen affinity.
When chlorine reacts with hydrogen, hydrogen has more affinity towards chlorine than towards oxygen, which results in the liberation of .
Thus, the correct answer is (3).

When chlorine water is exposed to sunlight, is liberated. Hence hydrogen has more affinity to

Thus, chlorine can displace oxygen from water. This indicates that the affinity of hydrogen for chlorine is more than the affinity of hydrogen for oxygen.