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Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of

A. 4 kgf/cm2 & 500°C

B. 10 kgf/cm2 & 1000°C

C. 40 kg/cm2 & 200°C

D. 100 kgf/cm2 & 500°C

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