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Chemistry [2 Mark Question Answer]

11.4 Alkynes · ICSE STD 10 (ICSE - English Medium). 10 questions.

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[2 Mark Question Answer]

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10 questions · timed · auto-graded

Question 12 Marks
Give the reactions of ethyne with Bromine.
Answer
Bromine:
$
CH + Br - Br \xrightarrow{ CCl _4} CHBr = CHBr
$
$
CHBr = CHBr + Br - Br \xrightarrow{ CCI _4} CHBr _2- CHBr _2
$
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Question 22 Marks
Give the reactions of ethyne with Water.
Answer
Water
$
CH \equiv CH + H _2 O +[ O ] \xrightarrow[ H _2 SO _4]{ HgSO _4} CH _3 CHO
$
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Question 32 Marks
Give the reactions of ethyne withHydrogen
Answer
Hydrogen:
$
CH \equiv CH + H _2 \xrightarrow{ Ni , 300^{\circ} C } CH _2= CH _2
$
$
CH _2= CH _2+ H _2 \xrightarrow{ NI } CH _3- CH _3
$
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Question 42 Marks
Give two chemical tests to distinguish between ethane and ethyne .
Answer
Two chemical tests to distinguish between ethane and ethyne are
(i) Bromine water test
(ii) Baeyers test
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Question 52 Marks
How will you convert
Ethyne to ethane

Answer
Ethyne to ethane:
$
CH \equiv CH + H _2 \xrightarrow{ Ni , 300^{\circ} C } CH _2= CH _2
$
$
CH _2= CH _2+ H _2 \xrightarrow{ Ni } CH _3- CH _3
$
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Question 62 Marks
Write the equations to show what happens when ethyne gas reacts with
Excess of hydrochloric acid
Answer
Equations:
Excess of Hydrochloric acid:
$
CH \equiv CH \xrightarrow{ HCI } CH _2= CHCI
$
$
CH _2= CHCI \xrightarrow{ HCl } CH _3- CHCI _2
$
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Question 72 Marks
Write the equations to show what happens when ethyne gas reacts with
Bromine water
Answer
Equations:
Bromine water:
$CH \equiv CH + Br - Br \xrightarrow{ CCI _4} CHBr = CHB $
$CHBr = CHBr + Br - Br \xrightarrow{ CCI _4} CHBr _2- CHBr _2$
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Question 82 Marks
What are addition reactions? How are addition reactions of ethene different
from ethyne?
Answer
Addition Reactions: The reactions in which molecules of the attacking
reagent add across the double or triple bond of an unsaturated compound to yield saturated compound.
In case of ethene the addition occurs due to presence of double bond hence one molecule of the compound is added whereas in case of alkynes there is presence of triple bond hence two molecules of the compound is added.
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Question 92 Marks
Give the names of the first four members of the homologous series of
alkynes.
Answer
First four members of the homologus series of alkynes are:
• Ethyne
• Propyne
• Butyne
• Pentyne
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Question 102 Marks
Write three uses of ethyne.
Answer
Uses of ethyne:
(i) For welding and cutting metals
(ii) For artificial ripening of fruits
(iii) As a general anaesthetic under the name Naracylene
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[2 Mark Question Answer] - Chemistry STD 10 Questions - Vidyadip