A halogen (x) reacts with sulphur gives a compound (y). (y) reacts with ethylene to give Mustard gas. Then

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x = Cl2 ; y = S2Cl2

x = Cl2 ; y = SCl4

x = Cl2 ; y = S2Cl

x = Br2 ; y = SCl2

answer is A.

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Detailed Solution

Cl2 +2S→S2Cl2 +2C2H4→ S(CH2-CH2-Cl)2 mustard gas,

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