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Test: Alkynes Reaction - NEET MCQ


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24 Questions MCQ Test Chemistry Class 11 - Test: Alkynes Reaction

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Test: Alkynes Reaction - Question 1

Direction (Q. Nos. 1 - 8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. Which of the following reaction would not give atleast one aldehyde product?

Detailed Solution for Test: Alkynes Reaction - Question 1

Correct answer is c because when we oxidise 1 pentyne with KMnO4 in basic medium, we will get a salt of a carboxylic acid.

Test: Alkynes Reaction - Question 2

Which set of reagent(s) in correct order would accomplish the following transformation?

Test: Alkynes Reaction - Question 3

The major product of the following reaction is

Test: Alkynes Reaction - Question 4

What is the final major product of the following reaction?

Test: Alkynes Reaction - Question 5

Predict major product of the following reaction.

Test: Alkynes Reaction - Question 6

What is true about the final major product of the reaction?

Test: Alkynes Reaction - Question 7

A chiral hydrocarbon has molar mass 82 and it gives effervescence when heated with Na metal. What is true about the original hydrocarbon?

Detailed Solution for Test: Alkynes Reaction - Question 7

A chiral hydrocarbon -Na → H
There is terminal triple bond in the reactant hydrocarbon because,
R - C ≡ C - H -NaR - C ≡ O Na++H2
Molecular mass = 82i.e., It is C6H10
 
(a) CH3 - CH2 - CH - C ≡ CH
                     |
                   CH3
                                       H2 | Pd | CaCO3    
          CH3 - CH2 - *CH - CH = CH2
                                  |
                                CH3
       Option A is wrong as it is chiral
 
 
CH3 - CH2 - CH - C ≡ CH
                     |
                   CH3
                                   Na| NH3    
         
            CH3 - CH2 - *CH - CH = CH2
                                  |
                                 CH3
          Option B is wrong as it is chiral
CH3 - CH2 - CH - C ≡ CH
                     |
                   CH3
                                        H2 | Ni   
          CH3 - CH2 - CH - CH2 = CH2
                                 |
                                CH3
       Option C is correct as it is achiral

Test: Alkynes Reaction - Question 8

A hydrocarbon X (C14H22)o n treatm ent with H2/Pt gives C14H26. Also X on treatm ent with alkaline KMnO4 followed by hydrolysis of products yields C7H12O2 which on further heating with soda lime gives cyclohexane. Hence, X is

Detailed Solution for Test: Alkynes Reaction - Question 8

The correct answers are option B.
As only 4 hydrogen atoms are increased after hydrogenation, there should be only 1 3× bond. So option B is correct.
 

*Multiple options can be correct
Test: Alkynes Reaction - Question 9

Direction (Q. Nos. 9 - 12) This section contains 4 multiple choice questions. Each question has fo ur choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. What is/are true about ozonolysis of 1-hexyne followed by aqueous work-up?

Detailed Solution for Test: Alkynes Reaction - Question 9

The correct answers are Options A, B and C.

*Multiple options can be correct
Test: Alkynes Reaction - Question 10

Which reagent(s) below results in a visible change withl-butyne and can be used to differentiate it from 2-butyne?

Detailed Solution for Test: Alkynes Reaction - Question 10

The correct answer is option  A,B.
(a)  Tollen's reagent produces a white precipitate of acetylide with terminal alkyne.
(b) Fehling solution produces a red precipitate with terminal alkyne.
So $$1-butyne$$ is terminal alkyne.

*Multiple options can be correct
Test: Alkynes Reaction - Question 11

Which of the following sets of reagent when applied sequentially, on 2-butyne will produce a meso product?

*Multiple options can be correct
Test: Alkynes Reaction - Question 12

The correct statement(s) regarding relative reactivity of an alkyne and an aklene is/are

Detailed Solution for Test: Alkynes Reaction - Question 12

b) Alkynes suffer less steric hindrance during adsorption on the surface of metal catalyst.
Hence, alkynes are more reactive than alkene towards catalytic hydrogenation.
c) Oxidation of alkenes with the help of ozone can give alcohols, aldehydes, ketones, or carboxylic acids.
Alkynes undergo ozonolysis to give acid anhydrides or diketones. If water is present in the reaction, the acid anhydride undergoes hydrolysis to yield two carboxylic acids.
d) The triple bonds of alkynes, because of its high electron density, are easily attacked by electrophiles, but less reactive than alkenes due to the compact C-C electron cloud.
 

Test: Alkynes Reaction - Question 13

Direction (Q. Nos. 13 - 14) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q. Column I has some alkynes and Column II has their corresponding reaction products. Match them appropriately.

Test: Alkynes Reaction - Question 14

Column I has some reactions and Column II has the characteristics of reactions and products of Column I. Match them appropriately.

Test: Alkynes Reaction - Question 15

Direction (Q. Nos. 15 - 20) This section contains 2 paragraphs, each describing theory, experiments, data, etc. Six questions related to the paragraphs have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage I

Unlike alkenes, alkynes undergo nucleophilic addition as well as electrophilic addition as :

 

Q. Which of the following best describes what happens in the first step in the mechanism of reaction shown below?

Test: Alkynes Reaction - Question 16

Passage I

Unlike alkenes, alkynes undergo nucleophilic addition as well as electrophilic addition as :

 

Q. Rates of Br2 addition were measured for a series of alkynes, giving the data shown.

Assuming that Br2 addition to alkynes proceeds through rate determining formation of cyclic bromonium ion, what generalisations can you make about the structure of rate determining transition state?

Test: Alkynes Reaction - Question 17

Passage I

Unlike alkenes, alkynes undergo nucleophilic addition as well as electrophilic addition as :

 

Q. Nucleophilic addition can occur on alkynes that bear strong electron withdrawing group such as — CF3 on the triple bond. Predict product of the following reaction :

Test: Alkynes Reaction - Question 18

Passage II

Two isomeric alkynes A and B have molecular formula C8H14 A on treatment with ammoniacal AgNO3 solution forms a white precipitate while B on similar treatment formed no precipitate. Also both A and B are chiral and hydrogenation of either A or B with H2/Pt gives the same achiral hydrocarbon C(C8H18). Treatment of A with HgSO4 /H2SO4 (aq) gives D(C8H16O) a s major product while sim ilar treatment of B, mixture of D and E in comparable amounts are formed.

 

Q. The structures of A and B are respectively

Test: Alkynes Reaction - Question 19

Passage II

Two isomeric alkynes A and B have molecular formula C8H14 A on treatment with ammoniacal AgNO3 solution forms a white precipitate while B on similar treatment formed no precipitate. Also both A and B are chiral and hydrogenation of either A or B with H2/Pt gives the same achiral hydrocarbon C(C8H18). Treatment of A with HgSO4 /H2SO4 (aq) gives D(C8H16O) a s major product while sim ilar treatment of B, mixture of D and E in comparable amounts are formed.

 

Q. The correct statement regarding A and B is

*Multiple options can be correct
Test: Alkynes Reaction - Question 20

Passage II

Two isomeric alkynes A and B have molecular formula C8H14 A on treatment with ammoniacal AgNO3 solution forms a white precipitate while B on similar treatment formed no precipitate. Also both A and B are chiral and hydrogenation of either A or B with H2/Pt gives the same achiral hydrocarbon C(C8H18). Treatment of A with HgSO4 /H2SO4 (aq) gives D(C8H16O) a s major product while sim ilar treatment of B, mixture of D and E in comparable amounts are formed.

 

Q. What is true regarding A and B?

*Answer can only contain numeric values
Test: Alkynes Reaction - Question 21

Direction (Q. Nos. 21 - 24) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. How many different isomeric alkynes on catalytic hydrogenation can give 2, 3, 4 -trimethyl heptane?


*Answer can only contain numeric values
Test: Alkynes Reaction - Question 22

 is treated will 2 moles of Br2, how many different isomers of products would be obtained?


*Answer can only contain numeric values
Test: Alkynes Reaction - Question 23

In the reaction below :

Q. How many different isomers of tetrabromides are formed?


Detailed Solution for Test: Alkynes Reaction - Question 23

It has 2 chiral carbons which can result in 4 stereoisomers, but 1 is a meso compound. So, 3 stereoisomeric tetrabromides are formed.

*Answer can only contain numeric values
Test: Alkynes Reaction - Question 24

How many reagents from the list below would give effervescence when reacted with 1-pentyne?


NaOH(l),   CH3CH2ONa(ll),
CH3CH2MgBr(lll),  NaH(IV),
NaNH2(V),   Na(VI)
NaHCO3(VII),   [(CH3)2CH]2NLi(VIII),
CH3CH2 Li(IX),   C6H5Li(X).


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