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An organic compound Ⓐ of molecular formula C2H6O reacts with thionyl chloride in the presence of pyridine gives Ⓑ C2H5Cl.Ⓑ on reaction with alcoholic KOH gives Ⓒ, C2H4.Ⓒ on treatmeni with Cl2 gives C2H4Cl2 as Ⓓ. Identify Ⓐ Ⓑ Ⓒ Ⓓ and explain the reaction.

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1. An organic compound Ⓐ of molecular formula C2H6O is Ethanol CH3 -CH2OH. 

2. Ethanol reacts with thionyl chloride in the presence of pyridine to give CH3 -CH2Cl Ⓑ as product.

3. Ethyl chloride on treatment with alcoholic KOH, undergoes dehydrohalogenation to give C2H4 , ethylene Ⓒ as the product.

4. Ethylene on reaction with Cl2 yield ethylene dichioride as Ⓓ as the product.

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