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Test: Reaction Mechanism Level - 3 - Chemistry MCQ


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20 Questions MCQ Test Organic Chemistry - Test: Reaction Mechanism Level - 3

Test: Reaction Mechanism Level - 3 for Chemistry 2024 is part of Organic Chemistry preparation. The Test: Reaction Mechanism Level - 3 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Reaction Mechanism Level - 3 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Reaction Mechanism Level - 3 below.
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Test: Reaction Mechanism Level - 3 - Question 1

For the reaction below if the concentration of KCN is increased four times, the rate of the reaction will be:

Test: Reaction Mechanism Level - 3 - Question 2

The major product formed in the reaction of 1, 3-butadiene with bromine is at high temperature:

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Test: Reaction Mechanism Level - 3 - Question 3

The products formed in the following reaction is:

Test: Reaction Mechanism Level - 3 - Question 4

In the reaction sequence, 

The product (Y) is: 

Test: Reaction Mechanism Level - 3 - Question 5

The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes

Detailed Solution for Test: Reaction Mechanism Level - 3 - Question 5

Substitution reaction:

  1. A substitution reaction is a type of chemical reaction, in which one functional group is replaced by another functional group.
  2. Metal complexes in which the rate of ligand displacement reaction is very fast and hence show very high reactivity is called labile complexes.
  3. Metal complexes in which the rate of ligand displacement reaction is very slow and hence show less reactivity are called labile complexes.

Explanation:

  1. In complexes, I, II, and III the metal ion involved is Ni, Pd, and Pt. Ni, Pd, and Pt are the elements of the 3d, 4d, and 5d series respectively. 
  2. The electrons present in d orbitals cannot shield the valence electrons and hence experience a much more effective nuclear charge on it.
  3. From 3d to 5d orbital, the effective nuclear charge on the valence electrons increases. Hence moving down the group from 3d to 5d series along a group, the inertness increases.
  4. So, from Ni to Pt, the inertness increases, and hence the rate of substitution of chloride by pyridine decreases.

Conclusion: Hence, the order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is I > II > III.

Test: Reaction Mechanism Level - 3 - Question 6

The major product formed in the following reaction. 

Test: Reaction Mechanism Level - 3 - Question 7

The major product formed in the following reaction.

Test: Reaction Mechanism Level - 3 - Question 8

The major product obtained in the following reaction

Test: Reaction Mechanism Level - 3 - Question 9

The major product formed in the following reaction is:

Detailed Solution for Test: Reaction Mechanism Level - 3 - Question 9

NaOEt is a strong base and it will abstract the acidic proton from the alpha carbon. Dueterium is abstracted from alpha carbon because it is show more +I effect than hydrogen. After that then elimination will occur with bromide as leaving group.

Hence C

Test: Reaction Mechanism Level - 3 - Question 10

Choose the correct order of reactivity for dehydration of the given alcoho ls using concentrated sulfuric acid. 

Test: Reaction Mechanism Level - 3 - Question 11

Electrophilic nitrations of the following compounds follow the trend:




Test: Reaction Mechanism Level - 3 - Question 12

The set of products formed in the following reaction is:

Detailed Solution for Test: Reaction Mechanism Level - 3 - Question 12

Test: Reaction Mechanism Level - 3 - Question 13

What would be the final major product of the following chemical reaction if it is carried out twice, one at 5 Co and the second time at 45 C0?

Test: Reaction Mechanism Level - 3 - Question 14

What is the major product if HBr (in excess) is added to H2C = CH – CH2 – OH

Test: Reaction Mechanism Level - 3 - Question 15

The reaction of sodium ethoxide with ethyl iodide to form diethyl ether is termed

Test: Reaction Mechanism Level - 3 - Question 16

What is the final product after the following reaction has gone to completion?

Test: Reaction Mechanism Level - 3 - Question 17

The major product formed in the following reaction is:

Detailed Solution for Test: Reaction Mechanism Level - 3 - Question 17

Singlet carbenes give stereospecific reactions. Option A is an example of a stereospecific reaction.

Test: Reaction Mechanism Level - 3 - Question 18

Among the bro mides I-III given below, the order of their reactivity in the SN1 reaction is:

Detailed Solution for Test: Reaction Mechanism Level - 3 - Question 18

SN1 reaction proceeds through carbocation as intermediate. Br- removed and made up carbocation in option A, B, C then we check the stability of carbonations. C is more stable because carbocation of C is aromatic, A is non aromatic and B is anti aromatic. So order of stability is:

Aromatic > Non-Aromatic > Anti Aromatic. Then more stable carbocation higher will be the reactivity and faster will be the SN1 reaction.

Hence C is correct.

Test: Reaction Mechanism Level - 3 - Question 19

The major product formed in the reaction benzoic acid with isobutylene in the presence of a catalytic amount of sulfuric acid is:

Test: Reaction Mechanism Level - 3 - Question 20

Among the following compounds, the one that undergoes deprotonation most readily in the presence of a base, to form a carbanion is:

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