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A compound of molecular formula C₇H₁₆ shows optical isomerism, compound will be

2,3-dimethyl pentane

2,2-dimethyl butane

2-methyl hexane

None of the above

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Stereoisomers (geometrical or opticals) which are neither superimposable nor mirror image to each other are called:

enantiomers

mesomers

tautomers

diastereomers

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Explanation

(d) It is the definition of diastereoisomers.

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Diastereomers can be separated by:

fractional distillation

simple distillation

electrophoresis

all of these

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Explanation

(a)

Recrystallization: solids that are selectively crystallized in the presence of other compounds.
the diastereomers have formed, is to separate them using recrystallisation. This is possible because enantiomers have shared physical properties such as melting point and boiling point, but diastereomers have different chemical properties, so they can be separated like any two different molecules.

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The angle of rotation of plane of polarized light depends upon:

the nature of the light beam

the number of the molecules

the number of asymmetric carbon atoms in the molecule of the substance

all of the above

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Explanation

(d) Read optical activity

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The process of separation of racemic mixture into d- and l-enantiomers is called:

revolution

resolution

hydration

dehydration

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Explanation

(b) It is definition of resolution.

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Which of the following will exhibit chirality?

2-methyl hexane

3-methyl hexane

Neopentane

Isopentane

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Explanation

(b) 3-methyl hexane contains chiral carbon atom, it exhibits chirality.

HCH3-CH2-C*(CH3)-CH2CH2CH3

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Number of tertiary carbon atoms in tertiary butyl alcohol is:

zero

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The number of isomers for the aromatic compound of the formula C₇H₈O is:

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Which one of the following is the stable structure of cyclohexatriene?

Chair form

Boat form

Half chair form

Planar form

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Explanation

(d) Benzene has planar structure.

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Meso tartaric acid is optically inactive due to the presence of:

molecular symmetry

molecular asymmetry

external compensation

two asymmetric carbon atoms

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Explanation

The rotation by upper half is internally compensated by the rotation of lower half to produce inactive nature.

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