Top 150+ Solved Pharmaceutical Organic Chemistry 3 MCQ Questions Answer
Q. Which of these is a comparatively insignificant factor affecting the magnitude of specific optical rotation.
a. Concentration of substance of interest
b. Temperature of measurement
c. Length of the sample tube
d. All of the above
Q. Which of the following is NOT true of enantiomers? They have the same:
a. boiling point.
b. melting point.
c. specific rotation.
d. chemical reactivity toward achiral reagents.
Q. Which statement is true for 1,3-dimethylcyclobutane?
a. Only one form of the compound is possible
b. Two diastereomeric forms are possible.
c. Two enantiomeric forms and one meso compound are possible.
d. None of the above.
Q. If a solution of a compound (30.0 g/100 mL of solution) has a measured rotation of +15º in a 2 dm tube, the specific rotation is:
a. +50º
b. +25º
c. +15º
d. +7.5º
Q. In the absence of specific data, it can only be said that (R)–2–bromopentane is:
a. dextrorotatory (+).
b. levorotatory (–).
c. analogous in absolute configuration to (R)–2–bromopentane.
d. optically inactive.
Q. Those stereoisomers which can be interconverted only by breaking and remaking of covalentbonds are called as____
a. Chain isomers
b. Positional isomers
c. Configurational isomers
d. Conformational isomers
Q. Those stereoisomers which can be interconverted by simple rotation about sigma bonds are called as____
a. Conformational isomers
b. Functional isomers
c. Geometric isomers
d. Tautomers
Q. A beam of light having a particular wavelength and having vibrations only in one plane is____
a. Ordinary light
b. Plane polarized light
c. Monochromatic light
d. None of above
Q. Optically active compound can rotate_____
a. Ordinary light
b. Plane polarized light
c. Monochromatic light
d. None of above
Q. Which instrument is used to measure angle of rotation?
a. Polarimeter
b. UV spectrometer
c. pH meter
d. Conductometer
Q. For being chiral compound, chemical compound should not possess following characteristic
a. Plane of symmetry
b. Centre of symmetry
c. Axis of symmetry
d. All of the above
Q. Followings are types of optical isomers except__
a. Enantiomers
b. Diasteromers
c. Conformers
d. Meso compounds