NEET Chemistry Questions: Basic Principles of Orgainc Chemistry

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Which one of the following pairs represents stereoisomerism?                                     





(d) Pair of optical isomerism and geometrical isomerism are able to exhibit the phenomenon of stereoisomerism because both types of isomers differ only in their orientation in space.

α-D-glucose and β-D glucose have a specific rotation of +112° and +19° respectively. In aqueous solution the rotation becomes +52°. This process is called:





(c) The conversion of α-glucose and β-glucose is called mutarotation.

 

Racemic mixture is formed by mixing two:





(d) A pair of d- l-optical isomers, i.e, enantiomer on mixing in equal moles gives racemic mixture.

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





No explanation available.

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





(d) It is the definition of diastereoisomers.

Diastereomers can be separated by:





(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.

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





(d) Read optical activity

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





(b) It is definition of resolution. 

Which of the following will exhibit chirality?             





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

                          HCH3-CH2-C*(CH3)-CH2CH2CH3                       

Number of tertiary carbon atoms in tertiary butyl alcohol is:





No explanation available.

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





No explanation available.

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





(d) Benzene has planar structure.

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





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

The property by virtue of which a compound can turn the plane of polarization of light is known as:





(c) It is the definition of optical activity.

The molecular formula of a saturated compound is C2H4Br2.This formula permits the existence of:





(c) 1,1-dibromoethane and 1,2-dibromoethane.