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Chemistry [2 Mark Question Answer]

11.3 Unsaturated Hydrocarbons · ICSE STD 10 (ICSE - English Medium). 3 questions.

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[2 Mark Question Answer]

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Question 12 Marks
Give two equations to show the conversion of a unsaturated compound to
saturated compound.
Answer
Two equations:
(i)
$
CH _2= CH _2+ H _2 \xrightarrow[300^{\circ} C ]{ Ni } CH _3- CH _3
$
(ii)
$
CH _2= CH _2+ H _2 O \xrightarrow{ H } CH _3- CH _2 OH
$
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Question 22 Marks
Write the balanced equations to convert:
(a) Ethanol to ethene
(b) Ethene to ethanol
Answer
(a) Ethanol to ethene:
$
CH _3 CH _2 OH \xrightarrow[170^{\circ} C ]{\text { conc } H _2 SO _4} CH _2= CH _2+ H _2 O
$
(b) Ethene to ethanol:
$
CH _2= Ch _2+ H _2 O \xrightarrow{ H } CH _3- CH _2 OH
$
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Question 32 Marks
Give three uses of ethene.
Answer
Three uses of ethene are:
1. It is used for the manufacture of polythene
2. For the artificial ripening of fruits.
3. As a general anaesthetic.
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