(a) Ethylene when reacts with halogens (chlorine and bromine) form saturated products. Name them and write balanced equations.
(b) Give the conditions and the main product formed by hydrogenation of ethylene.

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Solution

(a) Chlorine and bromine are added to the double bond of ethene to form saturated ethylene chloride and ethylene bromide respectively.

$C H_{2} = C H_{2} + C l_{2} ⟶ C l | C H_{2} - C l | C H_{2} 1,2-dichloroethane$

$C H_{2} = C H_{2} + B r_{2} ⟶ B r | C H_{2} - B r | C H_{2} 1,2-dibromo ethane$

(b) When ethene and hydrogen are passed over the finely divided catalyst such as platinum or palladium at ordinary temperature or nickel at 200 $^{o} C$ , the two atoms of the hydrogen molecule are added to the unsaturated molecule, which thus becomes a saturated one.

$C_{2} H_{4} + H_{2} N i - -- \to 200^{o} C C_{2} H_{6}$

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(a) Ethylene when reacts with halogens (chlorine and bromine) form saturated products. Name them and write balanced equations. (b) Give the conditions and the main product formed by hydrogenation of ethylene.

(a) Ethylene when reacts with halogens (chlorine and bromine) form saturated products. Name them and write balanced equations.
(b) Give the conditions and the main product formed by hydrogenation of ethylene.