As a dehydrating agent to convert ethanol to ethane . . . . . . . . is used. A. nickel B. sunlight C. concentrated sulphuric acid D. heat

The correct answer is: C. concentrated sulphuric acid

Concentrated sulphuric acid is a dehydrating agent because it can remove water from other substances. When ethanol is heated with concentrated sulphuric acid, the water molecules are removed and ethane is formed.

The other options are incorrect because they are not dehydrating agents.

• Nickel is a metal that is used in many chemical reactions, but it is not a dehydrating agent.
• Sunlight is a source of energy, but it is not a dehydrating agent.
• Heat can be used to drive chemical reactions, but it is not a dehydrating agent.