Engineering Chemistry Questions and Answers – Chirality

This set of Engineering Chemistry Questions and Answers for Aptitude test focuses on “Chirality”.

1. Chiral molecules are those which are?
a) Shows geometrical isomerism
b) Superimposable on their mirror images
c) Not superimposable on their mirror images
d) Unstable molecules
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2. Which of the following is not an example of chiral object?
a) Cylindrical helix
b) Square box
c) Sandal or shoe
d) Glove
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3. For any given substance, the amount of rotation does not depends upon _________
a) Wavelength of light used
b) Nature of the solvent
c) Temperature
d) Pressure
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4. If the rotation of the plane is clockwise, the substance is dextrorotatary.
a) True
b) False
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5. The specific rotation is inversely proportional to _________
a) Observed rotation
b) Temperature
c) Concentration of solution
d) D-line of sodium vapour light
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6. 0.5 g of an optically active compound was dissolved in 2mL of solvent at 25⁰C. The solution was kept in a cell of length 10 cm and observed rotation was +10⁰. What is the specific rotation of its enantiomer?
a) -40⁰
b) +40⁰
c) -10⁰
d) +10⁰
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7. To avoid excessive high value of molecular rotation, concentration is taken as _________
a) 1 centi-mole/mL
b) 1 milli-mole/mL
c) 1 mole/mL
d) 1 kilo-mole/mL
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8. Chiral molecules which are non-super-imposable mirror images of each other are called _________
a) Diastereomers
b) Meso compounds
c) Racemic mixture
d) Enantiomers
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9. Select the correct statement from the following option.
a) Enantiomer rotate plane of polarised light in opposite direction and to different extent
b) Enantiomer rotate plane of polarised light in same direction but to different extent
c) Enantiomer rotate plane of polarised light in same direction and to same extent
d) Enantiomer rotate plane of polarised light in opposite direction but to same extent
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10. Enantiomerism is the phenomenon of existence of enantiomers in a single structural formula, in _________ configuration.
a) Same
b) Opposite
c) Same as well as opposite
d) Initially opposite and then same
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11. Select the incorrect statement from the following option.
a) The physical properties of enatiomers are identical
b) In symmetrical environment, the chemical properties of enantiomers are identical
c) The enantiomers react at same rate and form products in same amounts in assymetrical environment
d) Enantiomers have different solubilities in the same chiral solvent
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12. Optical activity can also result from the lack of molecular symmetry in molecules.
a) True
b) False
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13. The plane which divides the molecule into two equal parts so that each half is the mirror image of other half is called _________
a) Centre of symmetry
b) Plane of symmetry
c) Axis of symmetry
d) Angle of symmetry
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14. When a molecule has a plane of symmetry, it will be ______________
a) Optically inactive
b) Optically active
c) Both optically active & inactive
d) Enantiomer
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15. A centre of symmetry is equivalent to _________ fold alternating axis of symmetry.
a) One
b) Two
c) Three
d) Four
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16. Diastereomers are _________
a) Geometrical isomers
b) Mirror images
c) Non-mirror images
d) Unstable molecules
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17. A plane of symmetry is equivalent to _________ fold alternating axis of symmetry.
a) One
b) Two
c) Three
d) Four
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18. As the optical activity changes with the wavelength of light, it is necessary not to use monochromatic light to measure optical activity.
a) True
b) False
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Sanfoundry Global Education & Learning Series – Engineering Chemistry.

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