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JEE Exam  >  JEE Tests  >  Chemistry for JEE Main & Advanced  >  Test: Properties and Preparation of Alkynes - JEE MCQ

Test: Properties and Preparation of Alkynes - JEE MCQ


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10 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Properties and Preparation of Alkynes

Test: Properties and Preparation of Alkynes for JEE 2024 is part of Chemistry for JEE Main & Advanced preparation. The Test: Properties and Preparation of Alkynes questions and answers have been prepared according to the JEE exam syllabus.The Test: Properties and Preparation of Alkynes MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Properties and Preparation of Alkynes below.
Solutions of Test: Properties and Preparation of Alkynes questions in English are available as part of our Chemistry for JEE Main & Advanced for JEE & Test: Properties and Preparation of Alkynes solutions in Hindi for Chemistry for JEE Main & Advanced course. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free. Attempt Test: Properties and Preparation of Alkynes | 10 questions in 20 minutes | Mock test for JEE preparation | Free important questions MCQ to study Chemistry for JEE Main & Advanced for JEE Exam | Download free PDF with solutions
Test: Properties and Preparation of Alkynes - Question 1
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Product of above reaction is:

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Test: Properties and Preparation of Alkynes - Question 2
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End product of the following sequence of reactions is

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Test: Properties and Preparation of Alkynes - Question 3
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A compound (X) reacts with ammonical to give a white precipitate, and on oxidation with hot alkaline gives the acid, , therefore is

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Ammonical silver nitrate (Tollens reagent) reacts with 1-alkyne only and give white ppt so reactant should be terminal alkyne.
Reaction with hot is: 

Test: Properties and Preparation of Alkynes - Question 4
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An unknown compound A has a molecular formula , when is treated with an excess of , a new substance with formula is formed. A forms a white precipitate with ammonical silver nitrate solution. A may be
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Let us form an equation according to the given condition

is butyne. It can either be But-1-yne or But-2-yne.
But-1-yne
But-2-yne
If the triple bond is present with the carbon atom 1 and 2 , then the hydrogen atom is present at C-atom 1 so it is acidic in nature.
is acidic in nature.
Since Ammoniacal silver nitrate is reducing agent, it reduces butyne, and butyne oxidize ammonical silver, nitrate solution.
We know that oxidation and Reduction occur together.
But-1-yne reduces by tollen's reagent and form white precipitate

Test: Properties and Preparation of Alkynes - Question 5
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CH3 − C ≡ CMgBr can be prepared by the reaction of
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CH3 − C ≡ CMg Br can be prepared by the reaction of CH3 − C = CH with CH3MgBr. This method is used in preparation of higher alkynes from lower alkynes. The chemical equation for the formation of CH3 − C ≡ CMgBr is given below

Test: Properties and Preparation of Alkynes - Question 6
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In the reacton
The product is:
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Test: Properties and Preparation of Alkynes - Question 7
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The major product formed in the following reaction is
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This reaction is show birch reduction mechanism.Birch reaction give trans alkene on treatment of alkyne . In this reaction generally use reagent is alkali metal with liquid NH3

Test: Properties and Preparation of Alkynes - Question 8
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The main product of the reaction is :
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It is a streoselective reaction and in it a trans product is formed.

Test: Properties and Preparation of Alkynes - Question 9
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Identify the reagent from the following list which can easily distinguish between 1 -butyne and 2-butyne
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Ammonical cuprous chloride gives precipitate (red) only with terminal alkynes, i.e. alkynes having acidic hydrogen atom, such as butyne-1
Test: Properties and Preparation of Alkynes - Question 10
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  Product is : Product
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