Top 150+ Solved Pharmaceutical Organic Chemistry 3 MCQ Questions Answer
Q. Which is the true option for Diastereomers?
a. They have only one chiral centre.
b. They have identical physical properties
c. They have two or more chiral centre.
d. All of the above.
Q. Ratio of dextro and levo isomers (d:l) of compound present in raceme mixture is__
a. 50:50
b. 40:60
c. 30:70
d. 20:80
Q. The process of separation of a racemic mixture into optically active d and l isomers is___
a. Racemization
b. Resolution
c. Both (a) and (b)
d. None of the above
Q. Absolute configuration of stereoisomer is denoted by__
a. R and S isomers
b. D and L isomers
c. d and l isomers
d. cis and tr
Q. Relative configuration of stereoisomer is denoted by__
a. R and S isomers
b. D and L isomers
c. d and l isomers
d. cis and tr
Q. The necessary conditions for geometric isomers are__
a. Presence of at least one double bond.
b. Each carbon atom of the double bond should be linked to two different atoms or groups.
c. Both (a) and (b)
d. None of the above.
Q. By studying which physical property, configuration of geometric isomers can be determined
a. Melting point
b. Solubility
c. Dipole moment
d. All of the above
Q. From the followings, which is true about conformational isomers?
a. Eclipsed conformation is more stable than staggered conformation.
b. Eclipsed conformation is less stable than staggered conformation.
c. Eclipsed conformation has low energy than staggered conformation.
d. None of the above
Q. Most stable conformation of cyclohexane is___
a. Chair conformation
b. Boat conformation
c. Twist boat conformation
d. Half chair conformation
Q. The hydrogens lying in the plane of the cyclohexane ring are called____
a. Axial hydrogens
b. Chiral hydrogens
c. Equatorial hydrogens
d. None of the above
Q. The hydrogens lying above or below the plane of the cyclohexane ring are called____
a. Axial hydrogens
b. Chiral hydrogens
c. Equatorial hydrogens
d. None of the above
Q. Which is the true sentence for stereospecific reactions from the followings,
a. Reactants react at different rate i.e. they have different rate of reaction.
b. They give different stereoisomers as products.
c. They have different paths to give different types of compounds as products.
d. All of the above
Q. Which of the following statements most accurately describes the stereochemistry between the various cyclohexanes?
a. Cis-1,2-dichlorocyclohexane and trans-1,2-dichlorocyclohexane rotate plane-polarized light in opposite directions, and together in equal proportions form a racemic mixture.
b. The diaxial and diequatorial forms of trans-1,3-dichlorohexane can be separated by their differing physical properties.
c. Only cis-1,4-dichlorocyclohexane is achiral due to a plane of symmetry, and cis-1,4- dichlorocyclohexane is diastereomeric to trans-1,4-dichlorocyclohexane.
d. The conformational isomers of tr
Q. Which of the following is the definition of a pair of diastereomers?
a. A pair of stereoisomers each of which has two chirality centers
b. Any pair of stereoisomers
c. A pair of stereoisomers that are not mirror images of one another
d. A pair of stereoisomers that are non-superimposable mirror images of one another
Q. What is the relation between the given compound?
a. constitutional isomers
b. enantiomers
c. Diastereomers
d. Identical