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Dehydrohalogenation of Dihalides

What happens ...

Question

What happens when 1,2-dibromoethane is boiled with alcoholic potassium hydroxide?

A

ethane is formed

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B

methane is formed

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C

ethene is formed

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D

ethyne is formed

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Solution

The correct option is D
ethyne is formed

When 1,2-dibromoethane (ethylene bromide) is boiled with alcoholic potassium hydroxide, ethyne is formed.

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Q. Choose the correct word/phrase from within the brackets to complete the following sentences:
(i) The catalyst used for conversion of ethene to ethane is commonly __________ (nickel/iron/cobalt).
(ii) When acetaldehyde is oxidized with acidified potassium dichromate, it forms _________ (ester/ethanol/acetic acid).
(iii) Ethanoic acid reacts with ethanol in presence of concentrated H₂SO₄, so as to form a compound and water. The chemical reaction which takes place is called __________ (dehydration/hydrogenation/esterification).
(iv) Write the equation for the reaction taking place between 1, 2-dibromoethane and alcoholic potassium hydroxide.
(v) The product formed when ethene gas reacts with water in the presence of sulphuric acid is ________ (ethanal/ethanol/ethanoic acid).

Q. The list of some organic compounds is given below:
ethanol, ethane, methane, ethyne, and ethene
From the above list, name a compound:
(i) formed by the dehydration of ethanol by concentrated sulphuric acid.
(ii) which forms methanoic acid on oxidation in the presence of copper at 200°C.
(iii) which has vapour density 14 and turns acidic potassium permanganate colourless.
(iv) which forms chloroform on halogenation in the presence of sunlight.
(v) which decolourises bromine solution in carbon tetrachloride.

Q. Give chemical equation for:
(a) The laboratory preparation of methane from sodium acetate.
(b) The reaction of one mole of ethene with one mole of chlorine gas.
(c) The preparation of ethyne from 1, 2-dibromoethane.

What happens when 1,2-dibromoethane is boiled with alcoholic potassium hydroxide?

Match the compounds, Ethanol, Methane, Ethanoic acid, Ethyne, and Ethene with the description given below:

Ethene is formed when it is dehydrated by concentrated Sulphuric acid.

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