Question

Ethene is formed when ethanol at 443 K is heated with excess of concentrated sulphuric acid

Answer 1

When ethanol is heated at 443k inthe presence of hot concentrated H2SO4 which acts as catalyst in this reaction to produce an unsaturated compound i.e. CH2CH2 (Ethene).
Reaction is:
C2H5OH in presence of hot conc.H2SO4 gives CH2CH2(Unsaturated compound).

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Answer 2

Answer:

your answer is

Therefore, concentrated sulphuric acid removes water from ethanol, thereby, acting as a dehydrating agent

this is a right answer