Question

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Answer 1

X →443 Kconc. H2SO4 Y ( unsaturated compound)
Z is hydrogen (Colourless gas)

X, Y and Z are alcohol, alkene and hydrogen respectively.

Suppose X is ethanol,it gives alkene on reacting with conc. H2SO4

C2H5OH (X) →443 Kconc. H2SO4 C2H4 (Y)

2C2H5OH →Na2C2H5O-Na+ + H2 (Z)

Role of sulphuric acid: It is used as a dehydrating agent in the above reaction.

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Answer 2

the gas is hydrogen gas
z is hydrogen gas
y is sodium sulphate
x is sulphur dioxide