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Question

Consider the following reactions:
CH2=CH2+Cl2/CCl4−−−−−−→Product A

CH2=CH2+H2Ni/Pt/Pd−−−−−−→Product B

Choose the correct option regarding the products formed :

A
A is 1-chloropropane
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B
A is 1,2-dichloroethane
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C
B is Ethene
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D
B is Ethyne
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Solution

The correct option is B A is 1,2-dichloroethane
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.

Addition of halogens:
Halogens like bromine and chlorine add up to alkene to form vicinal dihalides
CCl4 is the solvent.



Option (b) is correct.

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