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Test: Nucleophilic Substitution Reaction - Chemistry MCQ


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10 Questions MCQ Test Organic Chemistry - Test: Nucleophilic Substitution Reaction

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Test: Nucleophilic Substitution Reaction - Question 1

Among the following reactions, which one is incorrect?

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 1

(PrO) & (CH3) will be at same carbon atom & (OH) will be at adjacent carbon atom

α-halocarbonyl are the best SN2 substrate.
Here nucleophilic substitution reaction will happen and the above product will be formed. Hence this reaction is correct.
α-halocarbonyl are the best SN2 substrate for nucleophilic substitution reaction
Here (PrO) and (CH3) will be at same carbon atom and (OH) will be at adjacent carbon atom. Hence this reaction is wrong.
n-PrO– will attack the carbon atom attached to oxygen above the plane
n-PrO will attack the carbon atom attached to oxygen above the plane and the above product will be formed. Hence the reaction is correct.
Attack of Bromine ion (Br–) will be at that carbon atom where less substitution is present
Attack of Bromine ion (Br) will be at that carbon atom where less substitution is present, the above product will form. Hence this reaction is correct.

Test: Nucleophilic Substitution Reaction - Question 2

What will be the correct order of SN2/E2 ratio for the %yield of the product of the following halide?
Find the order of SN2/E2 ratio for the %yield of the product of the following halide

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 2

Least hindered halide give fastest SN2 reaction as the hindrance increases. As the hindrance increases, the occurrence of SN2 reaction decreases.
The order of SN2/E2 ratio for %yield of product of halide is III > IV > II > I

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Test: Nucleophilic Substitution Reaction - Question 3

Find configuration which will be adopted by X & Y respectively

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 3

When ether reacts with the reactant nucleophilic substitution conjugate base reaction (i.e. SNCB) will take place and there will be retention of configuration and it will be R product. When C5H5NH reacts with reactant SN2 reaction will take place and configuration inversion will take place and it will be S product.
Ether reacts with the reactant nucleophilic substitution conjugate base reaction

Test: Nucleophilic Substitution Reaction - Question 4

Which of the following curve correctly represents SN1 vs SN2?

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 4

As we know rate order in SN2 is CH3X > 1o > 2o > 3o halide and rate order in SN1 is CH3X < 1o < 2o < 3o halide. So according to the following representation.
The rate order in SN2 is H<sub>3</sub>X > 1<sup>o</sup> > 2<sup>o</sup> > 3<sup>o</sup> & rate order in SN1 is CH<sub>3</sub>X < 1<sup>o</sup> < 2<sup>o</sup> < 3<sup>o</sup>” width=”227″ height=”186″ class=”alignnone size-full wp-image-224020″ /></a></div>         </p>
<p>7. Which configuration will be adopted by X and Y respectively?<br />
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Test: Nucleophilic Substitution Reaction - Question 5

Which statement is incorrect about the following reaction?
The Final solution has radioactive iodine only in given reaction

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 5

The rate of reaction is directly proportional to the concentration of RI
Here the rate of reaction is directly proportional to the concentration of RI and (131I-), so statement is correct.
If any molecule undergoes substitution, then it forms inversion product due to SN2 reaction. Hence statement is correct.
For statement, below reaction one (+) molecule converts into (–) molecular and it also converts one optical reaction of (+) molecule.
Final solution contains both Iodine (I131) & normal (I)
Final solution contains both Iodine (I131) and normal (I). So, we can say this is the only incorrect statement about the above reaction.

Test: Nucleophilic Substitution Reaction - Question 6

Which of the following reaction will go faster if the concentration of the nucleophile is raised?
Find which reaction will go faster if the concentration of the nucleophile is raised

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 6

I & II reaction undergo via SN2 mechanism. III & IV reaction undergo via SN1 mechanism. As we know the rate of reaction in SN2 reaction is directly proportional to the concentration of nucleophile.

Test: Nucleophilic Substitution Reaction - Question 7

Which of the following compound shows the correct decreasing order of solvolysis with aqueous ethanol?
Find the compound showing the correct decreasing order of solvolysis with aqueous ethanol
The correct choice is:

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 7

The solvation of above compound can be compared by this trend, i.e. Solvation trend: 3O halide > 2O halide > 1O halide > vinylic halide. So, (III) molecule is an example of 3O halide, (II) molecule is an example of 2O halide, (IV) molecule is an example of 1O halide and (I) molecule is an example of vinylic halide.

Test: Nucleophilic Substitution Reaction - Question 8

SN1 reaction undergoes through a carbocation intermediate as follows:
Find the decreasing order of rate of SN1reaction in given reaction
[R = t-Bu, iso-Pr, Et, Me] (X = Cl, Br, I)
The correct statements are:
I. The decreasing order of rate of SN1reaction is t-BuX > iso-PrX > EtX > MeX
II. The decreasing order of ionization energy is MeX > EtX > iso-PrX > t-BuX
III. The decreasing order of energy of activation is t-BuX > iso-PrX > EtX > MeX

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 8

(1) Formation of carbocation is RDS, more stable the cation more easily it will form. Hence rate order is t-BuX > iso-PrX > EtX > MeX
(2) Formation of carbocation CH3 is most difficult hence ionization energy is highest. Similarly, EtX has lesser ionization energy than MeX and so on.
(3) Order of energy of activation is MeX > EtX > iso-PrX > t-BuX.

Test: Nucleophilic Substitution Reaction - Question 9

Which one is an excellent substrate for SN2 reaction?

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 9

Alpha-halo carbonyl undergoes fastest SN2 reaction due to the coupling of π* of CO bond and π* of C–X bond.

Test: Nucleophilic Substitution Reaction - Question 10

Which of the following is an incorrect statement?
The following is an incorrect statement is Formation of (III) involves E1 reaction

Detailed Solution for Test: Nucleophilic Substitution Reaction - Question 10

Rate of formation of II and IV similar because H & D are approximately of same size.
C–H & C–D bond breaking is the part of RDS hence rate in (I) is slower than (III)
It undergoes E2 not via E1 because carbocation is not stable.
Rate of formation of II & IV similar because H & D are approximately of same size

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