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Consider the reaction sequence: CaC2 + HCl → Gas X; Gas X + HCl (1 mol) → P1; P1 under high pressure and temperature with catalyst → P2. Gas X + (i) H2/Pd-BaSO4 then (ii) cold dilute KMnO4 → P3; P3 on polymerisation → P4. Which of the following statements is INCORRECT?

1. Product P2 is known as PVC
2. Product P3 is a dihydroxy alcohol
3. Product P4 is known as Glyptal
4. Benzene cannot be synthesized from gas X

Correct answer: Product P4 is known as Glyptal

Solution

X = acetylene (C2H2). P1 = vinyl chloride (CH2=CHCl). P2 = PVC (polyvinyl chloride, option A is correct). P3 = ethylene glycol (from Lindlar reduction to ethylene then cold KMnO4 syn-dihydroxylation, option B is correct). P4 = polyethylene glycol (a polyether), NOT Glyptal. Glyptal is a polyester made from ethylene glycol and phthalic acid, so option C is incorrect. Also benzene can be synthesised from acetylene by trimerisation, making option D also incorrect — but the question asks which is incorrect among the given, and option C is the standard expected answer.

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