Question

The compound formed when an alcoholic solution of ethylene dibromide is heated with granulated zinc is:
(A) Ethene
(B) Ethyne
(C) Ethane
(D) Bromoethane

Answer 1

An elimination reaction is a type of organic reaction in which two atoms or substituents that are on adjacent carbon atoms are removed from a molecule in either one step or two-step mechanism

Complete step by step solution:

In the question it is given that ethylene dibromide is heated with granulated zinc.
- The structure of the ethylene dibromide is as follows.

- The reaction of an alcoholic solution of ethylene dibromide is heated with granulated zinc is as follows

- The above reaction is called a dehalogenation reaction or elimination reaction.
- Zinc removes bromine atoms as zinc bromide ($ZnB{{r}_{2}}$).
Coming to given options, option B, Ethyne, means acetylene. But the product formed is not ethylene. So, it is wrong.
Coming to option C, ethane, but the product formed is acetylene. So, it is wrong.
Coming to option D, bromo ethane, it is also wrong,
Coming to option A, Ethene, means ethylene. This option is correct because the product formed in the above reaction is ethylene.

So, the correct option is A.

Note: Don’t be confused between ethane, Ethene, Ethyne. All are not the same.
Ethane-it is called alkane and a saturated compound.
Ethene-it is called alkene and ethylene. It is an unsaturated compound.
Ethyne- it is called as alkyne and called as acetylene. It is an unsaturated compound.