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Preparation of Alcohols from Alkenes

Decolorizatio...

Question

Decolorization of $K M n O_{4}$ solution takes place when it reacts with ethene. The final product of this reaction which is used as anti-freeze is:

A

ethylene glycol

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B

propylene glycol

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C

ethanol

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D

propanol

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Solution

The correct option is D ethylene glycol
Hydroxylation of ethene takes place in the presence of cold $K M n O_{4}$ to form Ethylene glycol. The reaction can be written as:
$C H_{2} = C H_{2} M n O_{4}^{2 -} - --- \to 25^{\circ} C H O C H_{2} - C H_{2} O H + M n O_{2}$

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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. When ethene reacts with bromine in aqueous sodium chloride solution the product/(s) obtained is /(are):

Q. Write the observation and name of the product for the following:
(i) When ethene is passed in bromine solution in CCl₄.
(ii) When Baeyer's reagent reacts with ethene.

Q. (i) What type of reaction takes place between ethane and chlorine to form monochloroethane?
(ii) The reaction between ethene and chlorine forms only one product. Name the type of the reaction.
(iii) (a) Draw the structural formula of ethene.
(b) What is the feature of the ethene structure, which allows ethene to react with chlorine in the way it does?

Q. Ethylene decolorizes alkaline

{K M n O}_{4}

solution. This is due to:

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