The electrolysis of aqueous potassium maleate gives which of the following products?

Identify $Z$ in the following sequence:
$C_3H_7OH$ $\xrightarrow{H_2SO_4} X$ $\xrightarrow{Br_2} Y$ $\xrightarrow{KOH} Z$

$2CaC_2$ $\xrightarrow{H_2O} X$ $\xrightarrow{Cu_2Cl_2 + NH_4Cl} Y$ ; $Y$ is

Which carbide reacts with water to produce propyne?

Identify $A$ in the following reaction.
$A$ $\xrightarrow{\text{Lithium amide}} \text{Ethynyl lithium}$ $\xrightarrow{\text{Bromoethane}} \text{but-}1\text{-yne}$

Predict the product $(A)$ for the following reaction:
$Ph-C^*(=CHBr)-C_6H_4-Br \xrightarrow{K^+ \, ^-OC(CH_3)_3, \text{ Heat}} (A)$(Note: $C^* = ^{14}C$)