Basics of Organic Reaction Mechanism MCQs Question and Answer in Engineering Chemistry

1.
The decreasing order of nucleophilicity for the following anions is CH₃C$${\text{O}}_2^ - $$, CH₃O^-, C₆H₅O^-, N$${\text{O}}_3^ - $$

A. CH₃C$${\text{O}}_2^ - $$ > CH₃O^- > C₆H₅O^- > N$${\text{O}}_3^ - $$

B. CH₃O^- > N$${\text{O}}_3^ - $$ > C₆H₅O^- > CH₃C$${\text{O}}_2^ - $$

C. CH₃O^- > C₆H₅O^- > CH₃C$${\text{O}}_2^ - $$ > N$${\text{O}}_3^ - $$

D. C₆H₅O^- > CH₃O^- > N$${\text{O}}_3^ - $$ > CH₃C$${\text{O}}_2^ - $$

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2.
The most appropriate sequence of the reactions for carrying out the following conversion

is

A. (i) peracid, (ii) H⁺, (iii) Zn/dil.HCl

B. (i) Alkaline KMnO₄, (ii) NalO₄, (iii) N₂H₄/KOH

C. (i) Alkaline KMnO₄, (ii) H⁺, (iii) Zn/dil.HCl

D. (i) O₃/Me₂S, (ii) NaOEt, (iii) N₂H₄/KOH

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3.
Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in ¹H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D₂O?

A. CH₃CO₂H

B. CH₃CONHC₆H₅

C. n-C₆H₁₃C ≡ CH

D. n-C₆H₁₃CHO

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4.
Conversion of Ph-NH₂ into Ph-CN can be accomplished by

A. reaction with sodium cyanide in the presence of nickel catalyst

B. reaction with chloroform and sodium hydroxide

C. diazotisation followed by reaction with CuCN

D. reaction with ethyl formate followed by thermolysis

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5.
The absolute configuration for compounds X and Y respectively are

A. R, S

B. S, R

C. R, R

D. S, S

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6.
The reactive intermediate involved in the conversion of phenol to salicylaldehyde using chloroform and sodium hydroxide is

A. Cl₂C:

B. Cl₂CH⁺

C. Cl₂CH^-

D. Cl₂C⁺

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7.
Order of reactivity of the following dienes X, Y and Z in Diels-Alder reaction is

A. X > Z > Y

B. Y > X > Z

C. Y > Z > X

D. X > Y > Z

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8.
The binaphthol (Bnp) is

A. an optically active compound with (R)-configuration

B. an optically inactive compound

C. a meso compound

D. an optically active compound with (S)-configuration

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9.
Aniline can be distinguished from methyl amine by its reaction with

A. p-toluene sulphonyl chloride/KOH

B. (i) NaNO₂/HCl, 0-5°C (ii) alkaline β naphthol

C. Sn/HCl

D. Acetyl chloride

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10.
For the compound,

the stereochemical notations are

A. 2Z, 4R

B. 2Z, 4S

C. 2E, 4R

D. 2E, 4S

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Basics of Organic Reaction Mechanism MCQs Question and Answer in Engineering Chemistry

1. The decreasing order of nucleophilicity for the following anions is CH3C$${\text{O}}_2^ - $$, CH3O-, C6H5O-, N$${\text{O}}_3^ - $$

Answer & Solution

2. The most appropriate sequence of the reactions for carrying out the following conversion is

Answer & Solution

3. Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in 1H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D2O?

Answer & Solution

4. Conversion of Ph-NH2 into Ph-CN can be accomplished by

Answer & Solution

5. The absolute configuration for compounds X and Y respectively are

Answer & Solution

6. The reactive intermediate involved in the conversion of phenol to salicylaldehyde using chloroform and sodium hydroxide is

Answer & Solution

7. Order of reactivity of the following dienes X, Y and Z in Diels-Alder reaction is

Answer & Solution

8. The binaphthol (Bnp) is

Answer & Solution

9. Aniline can be distinguished from methyl amine by its reaction with

Answer & Solution

10. For the compound, the stereochemical notations are

Answer & Solution

Read More Section(Basics of Organic Reaction Mechanism)

1.
The decreasing order of nucleophilicity for the following anions is CH₃C$${\text{O}}_2^ - $$, CH₃O^-, C₆H₅O^-, N$${\text{O}}_3^ - $$

2.
The most appropriate sequence of the reactions for carrying out the following conversion

is

3.
Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in ¹H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D₂O?

4.
Conversion of Ph-NH₂ into Ph-CN can be accomplished by

5.
The absolute configuration for compounds X and Y respectively are

6.
The reactive intermediate involved in the conversion of phenol to salicylaldehyde using chloroform and sodium hydroxide is

7.
Order of reactivity of the following dienes X, Y and Z in Diels-Alder reaction is

8.
The binaphthol (Bnp) is

9.
Aniline can be distinguished from methyl amine by its reaction with

10.
For the compound,

the stereochemical notations are