Which gas is produced by reaction of calcium carbide with water?

Q. Which gas is produced by reaction of calcium carbide with water?

Q. $Ca{C}_2+H_{2}O\to C_2{H}_2+Ca{\left(OH\right)}_2$
The reaction of calcium carbide and water produces acetylene gas ($C_2{H}_2$) and calcium hydroxide.
What volume of $C_2{H}_2$ will form from $0.200mol$ $Ca{C}_2$ which reacts with an excess of water? Assume the gas will be at STP conditions.

Q. Calcium carbide reacts with water to produce:

Q. The reaction of calcium carbide with $H_{2}O$ gives :

Q. A sweet smelling organic compound A is slowly oxidized by air in presence of light to a highly poisonous gas. On warming with silver powder, it forms a gaseous substance B, which is also produced by the action of calcium carbide on water. Identify A and B and write the chemical equations of the reactions involved.