Top 150+ Solved Pharmaceutical Organic Chemistry 3 MCQ Questions Answer
Q. Which of the following solvents is a heterocyclic compound?
a. DMSO
b. DMF
c. THF
d. None of the above
Q. Which of the followings statements is correct?
a. Pyrrole has less aromatic character than furan
b. Pyridine is isoelectronic with benzene
c. Pyridine is tertiary amine
d. Pyrrole is strong base
Q. What is the correct order of reactivity (most reactive first) of pyrrole, furan and thiophene towards electrophiles?
a. Furan > Pyrrole > Thiophene
b. Pyrrole > Furan > Thiophene
c. Furan > Thiophene > Pyrrole
d. Thiophene > Pyrrole > Furan
Q. Electrophilic substitution in furan usually occurs at:
a. Both the C2 and C3 atom
b. The O atom
c. The C2 atom
d. The C3 atom
Q. Nitration of pyrrole is best carried out using:
a. Acetyl nitrate
b. Ammonium nitrate
c. Concentrated nitric and sulphuric acid
d. Nitric acid
Q. If you wanted to form 2,3,4,5-tetrabromopyrrole from pyrrole, which of the followingconditions would be the best choice?
a. Br2 at 273K
b. Br2 at298 K
c. Br2 in the presence of radical initiator
d. Br2 in the presence of Lewis acid
Q. Which statement about thiophene is incorrect?
a. The S atom contributes two electrons to the n-system
b. Thiophene is polar
c. Thiophene is less reactive than pyrrole
d. Thiophene is more reactive than furan
Q. Pyrrole undergoes sulfonation in presence of _______to produce pyrrole – 2 – sulfonicacid.
a. Conc. Sulphuric acid
b. SO3 and pyridine
c. Dilute sulphuric acid/pyridine
d. SO3 and ethanol
Q. Pyrrole undergoes iodination in presence of Iodine and potassium iodide to produce_____.
a. 2 – iodo pyrrole
b. 3 – iodo pyrrole
c. Tetra iodo pyrrole
d. Tri iodo pyrrole
Q. Oxidation of pyrrole in presence of chromium oxide (Cr2O3) and acetic acidproduce_______.
a. Maleinimide
b. Maleic acid
c. Pyrrole N-oxide
d. None of the above
Q. Pyrrole is reduced by using Zn and acetic acid to get product_______
a. 2 – pyrroline
b. 3 – pyrroline
c. Pyrrolidine
d. All of the above