Organic Chemistry Multiple Choice Questions and Answers – Alkynes

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Questions
1 Alkynes are more reactive than alkenes.
A False
B True

Answer: False
2 Select the incorrect statement.
A The addition reactions occur more frequently in the alkenes than the alkynes
B The pi system of the alkynes gets weakened when they lose the pi atoms
C Alkynes readily undergo oligomerization
D Alkynes do not undergo polymerization

Answer: Alkynes do not undergo polymerization
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3 Select the incorrect statement regarding terminal alkynes.
A Methylacetylene is an example of terminal alkynes
B Terminal alkynes are more acidic when compared with alkenes
C Terminal alkynes are not as acidic as alkanes
D These have a replaceable acidic hydrogen atom

Answer: Terminal alkynes are not as acidic as alkanes
4 The major alkyne, acetylene compound is produced by which among the following application on natural gas?
A Hydrogenation
B Partial oxidation
C Cracking
D Hydrohalogenation

Answer: Partial oxidation
5 Majority of the alkynes are not prepared from/by ___________
A Condensation
B Acetylene
C Dehydrohalogenation
D Hydrogenation

Answer: Hydrogenation
6 Alkynes cannot be prepared from ___________
A Ketones
B Alcohols
C Aldehydes
D Other alkynes

Answer: Alcohols
7 The transformation into carboxylic acids of the alkynes takes place with the help of which among the following reagents?
A Potassium chlorate
B Potassium permanganate
C Potassium dichromate
D Potassium chloride

Answer: Potassium permanganate
8 Identify the incorrect statement.
A Alkynes exists in gaseous state
B They are soluble in water
C They are soluble in organic solvents
D Alkynes have a very good boiling point

Answer: They are soluble in water
9 Which among the following alkynes is used as a rocket fuel?
A Ethyne
B Propyne
C But-1-yne
D Pent-1-yne

Answer: Propyne
10 Which among the following product is formed when ethyne undergoes hydrogenation?
A Formaldehyde
B Formic acid
C Acetaldehyde
D Acetic acid

Answer: Acetaldehyde

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