From the given flow-chart, identify A and B.

A is ethanol, B is ethyl ethanoate

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A is acetic acid, B is ethene

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A is ethanol, B is ethene

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A is ethanal, B is ethene

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Solution

The correct option is B A is ethanol, B is ethene
A is an alcohol (ethanol) which undergoes dehydration in the presence of conc. $H_{2} S O_{4}$ to form an alkene (ethene) . Th reaction can be written as:
$C H_{3} - C H_{2} - O H Δ - ------ \to c o n c . H_{2} S O_{4} C H_{2} = C H_{2}$
Ethene further undergoes hydrogenation to form ethane as; $C H_{2} = C H_{2} N i - \to H_{2} C H_{3} - C H_{3}$
Thus A is ethanol and B is ethene.

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Q. Ethanol can be converted to ethene which can then be changed to ethane.
Choose the correct word or phrase from the brackets to complete the following sentences:
(i) The conversion of ethanol to ethene is an example of ........... (dehydration, dehydrogenation).
(ii) Converting ethanol to ethene requires the use of ......... (concentrated hydrochloric acid, concentrated nitric acid, concentrated sulphuric acid).
(iii) The conversion of ethene to ethane is an example of ......... (hydration, hydrogenation).
(iv) The catalyst used in the conversion of ethene to ethane is commonly ............ (iron, cobalt, nickel).

Q. From the list of compounds given, identify the compound which gives formaldehyde on treatment with a suitable reagent.
(a) Ethene (b) Ethyne
(c) Methanol (d) Formic acid
(e) Ethanol (f) Acetic acid

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. Write balanced equations to show the preparation of the following:
(i) ethane from sodium propionate
(ii) ethene from ethanol
(iii) ethyne from calcium carbide
(iv) ethanoic acid from ethane

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