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Question

For the given reaction , the major products A and B respectively are :


A
1-chloroporpane and Ethyne
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B
1,2-dichloroethane and ethane
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C
chloroethane and ethane
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D
None of the above
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Solution

The correct option is B 1,2-dichloroethane and ethane
Addition of halogens:
Halogens like bromine and chlorine add up to alkene to form vicinal dihalides
CCl4 is the solvent.

Addition of dihydrogen :

Alkene+H2Ni/Pt/Pd−−−−−Alkane+heat

When nickel is used as a catalyst for addition of dihydrogen, then the reaction is known as Sabatier-Senderens reaction.
So , B is ethane.
The addition of hydrogen is called hydrogenation.The heat released in a hydrogenation reaction is called the heat of hydrogenation i.e. ΔHHOH

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