Top 150+ Solved Pharmaceutical Organic Chemistry 3 MCQ Questions Answer

a. Diastereomers

b. constitutional isomers

c. enantiomers

d. identical

a. All (+) enantiomers are levorotatory

b. All (-) enantiomers rotate plane polarized light in a clockwise direction

c. (+) and (-) enantiomers rotate plane polarized light in opposite directions

d. All R enantiomers are dextrorotatory

a. Only 1

b. Only 2

c. 1 and 3

d. 2 and 3

a. 2-methylpropane

b. 2-methylpentane

c. 3-methylpentane

d. 3-methylhexane

a. A racemate contains equal amounts of (+)-A and (–)-A

b. If A is resolved, it is separated into its enantiomers

c. (+)-A can also be labelled R-A, because (+) means the same as R

d. (+)-A and (–)-A will rotate polarized light equally but in opposite directions

a. The superimposability of an object on its mirror image

b. A molecule with a mirror image

c. The non-superimposability an object on its mirror image

d. A molecule that has a carbon atom with four different substituents

a. Plane of symmetry (POS)

b. Center of symmetry (COS)

c. Axis of symmetry (AOS)

d. Alternating axis of symmetry (AAOS)

a. A pair of stereoisomers each of which has two chirality centres

b. A pair of stereoisomers that are not mirror images of one another

c. A pair of stereoisomers that are non-superimposable mirror images of one another

d. Any pair of stereoisomers

a. R and S

b. E and Z

c. + and –

d. D and L

a. Assignments of R and S labels and (+) and (–) labels are not connected

b. The labels R and S refer to different conformers

c. The labels (+) and (–) are used to distinguish enantiomers

d. The specific rotation of enantiomers is equal and opposite

a. CH3CH2CH2CHBrCH3

b. CH3CH2CBr2CH3

c. CH3CHBrCH2CH3

d. CHBr2CH2CHBrCH3

a. Polarity of the substance

b. Angle of rotation of an optical active compound

c. Concentration of the substance

d. pH of the substance

a. +2.4°

b. +4.8°

c. +19°

d. +9.6°

a. polarization of light

b. change of the electrical conductivity of solution with composition

c. change of angle of refraction with composition

d. change of electrical conductivity of solution with temperature

a. CH3

b. CH2Cl

c. CH2OH

d. CHO