Engineering Chemistry I Mock Test 6

10%

Question 1 of 10

1. Which of the following act as electrophile in halogenation?

Sulphonium ion

Nitronium ion

Halonium ion

Acylium ion

Question 1 of 10

Question 2 of 10

2. The formal charge at the carbanion is ___________

-1

Question 2 of 10

Question 3 of 10

3. Select the correct statement from the following option.

All of the mentioned

It possess an unshared pair of electron

Carbanion is the intermediate compound

In carbanion, central carbon atom carries negative charge

Question 3 of 10

Question 4 of 10

4. The order of the reaction, if the time of half-completion is changed from 50 sec to 25 sec, when the initial concentration is changed from 0.5 to 1M will be ___________

Question 4 of 10

Question 5 of 10

5. Which of the following act as catalysis in the nitration of benzene?

Conc. H₂SO₄

Conc. HCl

Dil. HCl

Dil. H₂SO₄

Question 5 of 10

Question 6 of 10

6. An activating substituent group activates ___________

Both ortho and para positions

Para position

Meta position

Ortho position

Question 6 of 10

Question 7 of 10

7. A deactivating substituent group directs ___________

Both ortho and para positions

Ortho position

Meta position

Para position

Question 7 of 10

Question 8 of 10

8. In a first order reaction, the time required for the completion of 99% is _______ times the time required for the completion of half of the reaction.

Question 8 of 10

Question 9 of 10

9. Arrange the following in the decreasing order of leaving group in nucleophilic substitution reaction.

H^- > Cl^- > HO^- > Br^- > CH₃COO^-

Cl^- > Br^- > HO^- > H^- > CH₃COO^-

HO^- > CH₃COO ^- > H^- > Br^- > Cl^-

Cl^- > Br^- > CH₃COO ^- > HO^- > H^-

Question 9 of 10

Question 10 of 10

10. In a first order reaction, the time required for the completion of 99% is _______ for its 90% completion.

Negligible

Thrice

Same

Twice

Question 10 of 10