An organic compound (A) of a molecular formula C_(2)H_(4), decolourises brom water. (A) on reacts with Cl_(2) gives (B). (A) reacts with HBr to give (C). (A) rean presence of Ni to give D. Identify A, B, C and D. Explain the reactions.

An organic compound (A) of a molecular formula C_(2)H_(4), decolourise

1.	An organic compound (A) of a molecular formula C_(2)H_(4), decolourises brom water. (A) on reacts with Cl_(2) gives (B). (A) reacts with HBr to give (C). (A) rean presence of Ni to give D. Identify A, B, C and D. Explain the reactions.
Answer» Solution :1. `C_2H_4(A)`,decolorise the bromine water . Therefore it contains double bond. Hence (A) is ethylene. 2.`underset("Ethylene"(A))(CH_2)+Cl_2 tounderset(1,2"dichloro ETHANE")underset(Cl)underset(\|)(CH_(2))-underset(Cl)underset(\|)(CH_(2))-Br` 3. `underset("Ethylene(A)")(CH_(2))=CH_2 +HBR to underset("Ethyl Bromide(C)")(CH_(3))-CH_(2)-Br` `CH_(2)=CH_(2)+H_(2) overset(Ni)underset(298K)to underset("Ethane(D)")(CH_(3))-CH_(3)`