When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?
substitution
addition
polymerization
hydrolysis
reduction
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The question is wrongly composed:
An addition reaction is a reaction in which one molecule combines with another to form a larger molecule with no other product.
Ethene + Cl2 to form 1,2 dichloroETHENE and definitely with +H2 is a substitution reaction but where it forms 1,2 dichloroETHANE it becomes an addition reaction.
REF: https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/addene1.htm
when addition rxn takes place in double bond, the double bond will decrease I. e ethene will change to ethane
but here, it undergoes substitution rxn
it is a substitution reaction bcos cl2 was used to substitute H2 and it wii only be addition reaction if it forms a greater molecule
In 1,2 dichloroethene(C2H2CL2),two hydrogen atoms from ethene(C2H4) has been SUBSTITUTED by two chlorine atoms hence the answer is A,substition reaction But if it was an addition reaction,dichloroethane(C2H4CL2) would be formed as two chlorine atoms are added to ethene(C2H4)
