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C_{2} H_{5} O H + S O C l \to ?

C_{2} H_{5} C l_{2} + H_{2} S O_{4}

C_{2} H_{4} C l_{2} + H_{2} S O_{4}

C_{2} H_{4} + S O_{2} + H C l

C_{2} H_{4} S O_{4} + 2 H C l

ANS : 3

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