Top 150+ Solved Pharmaceutical Organic Chemistry 3 MCQ Questions Answer
Q. What would be the product of following reaction?
a. Thiophene
b. Thiazole
c. Purine
d. Pyrimidine
Q. 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
Q. 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.
Q. 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
Q. Thiophene shows electrophilic substitution reactions mainly at position___.
a. C2
b. C3
c. C4
d. C5
Q. Which condition is appropriate for the nitration of thiophene?
a. Acetyl nitrate
b. Nitric acid +acetic anhydride
c. Concentrated nitric acid
d. Sodium nitrate
Q. 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
Q. Sulfonation of thiophene can be carried out by using______________.
a. SO3 +Conc. HCl
b. Dilute Sulphuric acid
c. Concentrated Sulphuric acid
d. SO3 + HNO3
Q. Chloromethylation of thiophene is carried out with HCHO & HCl, it will produce_______.
a. 2- chloromethyl thiophene
b. 2- methyl thiophene
c. 2- chloro thiophene
d. 2-chloro, 5- methyl thiophene
Q. What will be the product of the following reaction?
a. 2- iodo thiophene
b. 2,5 – di iodo thiophene
c. 2,3 – di iodo thiophene
d. Tetra iodo thiophene
Q. What will be the product of the following reaction?
a. 5 – bromo thiophene
b. 3- bromo thiophene
c. 2 – bromo thiophene
d. 2,5 – di bromo thiophene
Q. Chlorination of thiophene by using Chlorine at 243K will form__________.
a. 2- chloro thiophene + 5- chloro thiophene
b. 2,5 – dichloro thiophene
c. 2- chloro thiophene + 2,5- dichloro thiophene
d. Tetra chloro thiophene