Pharmaceutical Organic Chemistry 3 MCQs

A

Admin • 31.08K Points
Instructor I

Q 21. Identify the reaction: When thiophene react with dimethyl formamide in the presence of POCl3, it will produce thiophene – 2 – carboxaldehyde.

(A) Kolbe reaction
(B) Canizzaro reaction
(C) Gattermann Koch reaction
(D) Vilsmeir – Hoack reaction

R

Ranjeet • 28.49K Points
Instructor II

Q 22. Which condition is appropriate for the nitration of thiophene?

(A) Acetyl nitrate
(B) Nitric acid +acetic anhydride
(C) Concentrated nitric acid
(D) Sodium nitrate

R

Rakesh Kumar • 22.47K Points
Instructor III

Q 23. Thiophene shows electrophilic substitution reactions mainly at position___.

(A) C2
(B) C3
(C) C4
(D) C5

V

Vinay • 22.73K Points
Instructor III

Q 24. Which is the true statement from followings?

(A) Thiophene is more stable than pyrrole
(B) Thiophene is more stable than furan
(C) Both (a) & (b)
(D) None of the above

P

Praveen Singh • 30.56K Points
Instructor I

Q 25. What is not true about thiophene from the following sentences?

(A) Thiophene shows aromaticity.
(B) Thiophene contains oxygen heteroatom.
(C) Thiophene has diene like structure.
(D) Thiophene has a flat pentagonal ring.

V

Vikash Gupta • 27.68K Points
Instructor II

Q 26. What would be the appropriate reaction condition for the following reaction;

(A) SO2/AlCl3/673K
(B) H2S/AlCl3/273K
(C) H2S/Al2O3/673K
(D) Sulphur/heat

V

Vijay Sangwan • 22.51K Points
Instructor III

Q 27. What would be the product of following reaction?

(A) Thiophene
(B) Thiazole
(C) Purine
(D) Pyrimidine

P

Praveen Singh • 30.56K Points
Instructor I

Q 28. Complete the reaction:

(A) Thiazole
(B) Oxazole
(C) Thiphene
(D) Furan

R

Ram Sharma • 192.10K Points
Coach

Q 29. Which is the following heterocyclic compound?

(A) Thiophene
(B) Thiazole
(C) Furan
(D) Pyrrole

V

Vijay Sangwan • 22.51K Points
Instructor III

Q 30. Which heterocyclic ring is present in Rofecoxib, NSAID?

(A) Pyrrole
(B) Furan
(C) Purine
(D) Indole

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