Question

Ethylidene dichloride is obtained by the reaction of an excess of HCl with.
(A) Ethylene
(B) Acetylene
(C) Propane
(D) Methane

Answer 1

Hint: The structure of the Ethylidene dichloride is as follows.

Ethylidene dichloride is also called Gem dihalides. Gem halogens mean the halogen atoms (chlorine) present on the same carbon atom in the molecule.

Complete step by step solution:
-Ethylidene chloride is also called 1,1-dichloroethane.
-We have to prepare Ethylidene dichloride by using an excess amount of HCl.
-Coming to the given options, option A, Ethylene. Alkenes generally form only monochloro derivatives with hydrochloric acid.

-So, option A is wrong.
-Coming to option B, Acetylene. Acetylene reacts with an excess amount of HCl and forms Ethylidene dichloride as the product. The reaction is as follows.

-It is a best example for electrophilic addition reaction.
-Coming to option C, Propane. Propane does not form Ethylidene dichloride with an excess amount of HCl. So, option C is wrong.
-Coming to option D, Methane. Methane does not form Ethylidene dichloride with an excess amount of HCl. So, option D is wrong.
-Therefore acetylene forms Ethylidene dichloride with an excess amount of HCl.

So, the correct option is (B).

Note: Don’t be confused with Ethylidene chloride and ethylene dichloride. Both are not the same.
Ethylidene chloride and ethylene dichloride can be differentiated by reacting with water.
Ethylidene chloride forms acetaldehyde on reaction with water and ethylene dichloride forms 2-chloro ethanol on reaction with water.