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Organic Chemistry Multiple Choice Questions and Answers – Alkynes

Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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
(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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