IIT JEE/IIT JEE Isomerism And Stereochemistry Sample Test,Sample questions

Question:
A certain compound contain three chirality centres. The maximum number of stereoisomers it can have is

1.8

2.6

3.9

4.3


Question:
A compound whose molecules are superimposable on their mirror images even though they contain asymmetric carbon atoms is called




1.A threo compound

2.An erythro compound

3.Adissymmetric compound

4.A meso compound.


Question:
A racemic mixture contains equal ........ of dextrorotatory and laevorotatory isomers.




1.No. of molecules

2.Masses

3.No. of moles

4.All the above are correct.


Question:
Anthracene is isomeric with




1.Phenanthrene

2.Naphthalene

3.Benzene

4.None of these.


Question:
cis-2-butene and trans-2-butene can be distinguished on the basis of




1.their hydrogenation products

2.their optical rotation

3.their ozonolysis products

4.their addition procucts with bromine.


Question:
d and l forms of tartaric acid are mixed in equal proportions. The mixture is called




1.Utectic mixture

2.Azeotropic mixture

3.Diastereomers

4.Racemic mixture


Question:
Enantiomerism was discovered by




1.Vant Hoff and Le Bell

2.Louis Pasteur

3.Berzelius

4.Kolbe.


Question:
Ethoxyethane and 1-methoxy propane are




1.Chain isomers

2.Position isomers

3.Metamers

4.Tautomers.


Question:
Geometric isomerism will be exhibited by




.

1.1-Pentene

2.3-Methyl-1-butene

3.2-Pentene

4.All ot these compounds


Question:
How many isomer are possible for methylanthracene

1.2

2.3

3.4

4.5


Question:
Maleic acid and fumaric acid are




1.Position isomers

2.Geometric isomers

3.Enantiomers

4.Functional isomers


Question:
Maleic acid and fumaric acid are




1.Homologous

2.Geometrical isomers

3.Enantiomers

4.Diastereomers.


Question:
n-Butane and iso-butane are .......... isomers




1.Chain

2.Position

3.Geometric

4.Optical.


Question:
Number of dibromo derivatives possible for propane are

1.2

2.3

3.1

4.4


Question:
ow many chirality centres are present in the structrue 1-chloro-2-methylchlorohexane ?

1.2

2.3

3.4

4.1


Question:
Tartaric acid and meso-tartaric acid are




.

1.Enantiomers

2.Diastereomers

3.Geometric isomers

4.None of these


Question:
The angle of rotation ofplane polarized light in polarimeter depends upon




.

1.Cmnc. of the substance

2.Length of the tube

3.Nature ofthe substance

4.All of these


Question:
The compound which is not isomeric with diethyl ether is




1.n-Propyl methyl ether

2.1-Butanol

3.2-Methyl-2-propanol

4.Butanone


Question:
The energy difference between boat and chair conformations of cyclohexane is about


1.150 kJ/mole

2.30 kJ/mole

3.12.5 kJ/mole

4.50 kJ/mole


Question:
The energy difference between staggered and eclipsed conformations of etane is about

1.25 kJ/mole

2.30 kJ/mole

3.100 kJ/mole

4.12.5 kJ/mole


Question:
The functional isomers of ethane nitrile is




1.Ethyl carbylamine

2.Methane nitrile

3.Methyl carbylamine

4.Propane nitrile.


Question:
The functional isomers of ethers are




1.Ketones

2.Aldehydes

3.Alcohols

4.Esters.


Question:
The instrument used for measuring specific rotation is




1.Spectrometer

2.Polarimeter

3.Lactometer

4.Ammeter.


Question:
The least stable conformation of cyclohexane is




1.Boat

2.Chair

3.Twist boat

4.Half chair.


Question:
The number of dichloro derivatives of naphthalene is




1.Ten

2.Fourteen

3.Six

4.Five.


Question:
The number of monosubstitutionderivatives possible for naphthalene is


1.one

2.two

3.three

4.four


Question:
The number of stereoisomers possible for 2 3-pentanediol is




1.two

2.three

3.four

4.five.


Question:
The process of separation of (dl)-mixture into its constituents is referred to as




.

1.Fractional distillation

2.Resolution

3.Fragmentation

4.Sedimentation


Question:
The simplest alcohol that can exhibit enantiomerism is




.

1.1-Propanol

2.1-Butanol

3.2-Propanol

4.2-Butanol


Question:
The simplest alkane capable of exhibiting chain isomerism has ..... carbon atoms.




1.three

2.five

3.four

4.six.


Question:
The simplest alkane which can exhibit enantiomerism has


1.5 carbon atoms

2.6 carbon atoms

3.7 carbon atoms

4.4 carbon atoms


Question:
The simplest alkene which is capable of exhibiting geometric isomerism has



1.3 carbon atoms

2.5 carbon atoms

3.6 carbon atoms

4.4 carbon atoms.


Question:
Total number of conformations of ethane are




1.2

2.3

3.4

4.Infinite.


Question:
Which of th efollowing compounds is expected to be most reactive ?




1.Cyclohexane

2.Cyclopropane

3.Cyclobutane

4.Cyclopentene.


Question:
Which of th efollowing does not contain any asymmetric carbon but can show enantiomerism ?




1.Lactic acid

2.13-Pentadiene

3.Trataric acid

4.23-Pentadiene.


Question:
Which of th efollowing isomerisms is shown by alkenes but not by alkanes ?




1.conformational

2.Optical

3.Geometric

4.Chain.


Question:
Which of the following alkanes can form only two monochloro derivatives ?




1.Hexane

2.2-Methyl pentane

3.23-Dimethylbutane

4.3-Methyl pentane.


Question:
Which of the following can exhibit enantiomerism ?




1.cis-12-Dichlorocyclobutane

2.trans-12-Dichlorocyclobutane

3.cis-12-Dichlorocyclobutane

4.trans-13-Dichlorocyclobutan


Question:
Which of the following can exist as diastereomers ?




1.Lactic acid

2.1-Butene

3.2-Butene

4.Ethane.


Question:
Which of the following compound has chiral structure ?




1.2-Metyylpentane

2.23-Dimethylpentane

3.Isoamyl alcohol

4.Trimethylamine.


Question:
Which of the following compound will show stereoisomerism ?




1.4-Chlorobutan-1-ol

2.Tertiary butyl alcohol

3.sec-butyl amine

4.n-butyl alcohol.


Question:
Which of the following compounds can exhibit geometrical isomerism ?




1.1-Hexene

2.2-Methyl-2-pentene

3.3-Methyl-1-pentene

4.2-Hexene.


Question:
Which of the following compounds can exist in mesoform ?




1.12-Dichlorobutane

2.23-Dichloropentane

3.23-Dichlorobutane

4.none


Question:
Which of the following compounds can show geometric isomerism ?




.

1.Vinyl chloride

2.1,1-Dichloroethene

3.1,2-Dichloroentene

4.Trichloroethene


Question:
Which of the following compounds does not exhibit geometric isomerism ?




1.11-Dichloro-2-butene

2.12-Dichloro-2-butene

3.11-Dichloro-1-butene

4.23-Dichloro-2-butene.


Question:
Which of the following compounds exhibit tautomerism ?




1.Cloroethane

2.Ethanol

3.Ethoxyethane

4.Nitroethane.


Question:
Which of the following compounds is isomeric with trimethyl amine ?




1.1-Propanamine

2.2-Propanamine

3.both

4.None.


Question:
Which of the following is a chiral molecule ?




1.1-Chloropropane

2.2-Chloropropane

3.1-Chlorobutane

4.2-Chlorobutane.


Question:
Which of the following is responsible for the inability of meso compound to show optical activity ?





1.Absence of chirality centre

2.Presence of more than one chirality centres

3.Dissymmetric nature of its structure

4.Internal compensation.


Question:
Which of the following is the functional isomer of methyl acetate ?




.

1.Ethyl acetate

2.Propanoic acid

3.Ethyl formate

4.Propanone


Question:
Which of the following pairs of compounds are tautomers ?




1.Propanol and propanone

2.1-Propanol and 2-propanol

3.Ethanol and vinyl alcohol

4.Vinyl alcohol and ethanal.


Question:
Which of the following statements is false ?





1.Enantiomers have same m.p. and b.p.

2.A mixture containing equal amounts of enantiomers is optically inactive

3.Enantiomers have same chemical properties

4.A micture containing two enantiomers can be separated into fractions containing pure enantiomers.


Question:
Which of thefollowing conformations of n-butane is the least stable ?




1.Gauche

2.Anti

3.Eclipsed

4.Fully eclipsed.


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