Practice Test


1) Which pair represents chain isomers?


2) Which are isomers?


3) Amines exhibit


4) The isomerism exhibited by n - butyl alcohol and iso - butyl alcohol is


5) Compounds having same molecular formula but different properties are called


6) An alkane forms isomers if the number of carbon atoms is.


7) n - Propyl alcohol and iso - propyl alcohol are


8) Isomerism exhibited by acetic acid methyl formate is


9) Aldehydes are isomeric with ........ of same molecular formula


10) The number of isomeric xylenes is


11) The type of isomerism observed in urea molecule is


12) Can homologues be isomers?


13) Which of the following statements is necessarily true in the case of isomeric organic compounds?


14) Isomerism among compounds due to the migration of proton is known as


15) The tautomeric form which is less stable is called


16) Acetone and propen - 2 - ol are


17) Vinyl alcohol and acetaldehyde are


18) o - hyroxytoluene and benzyl alcohol are


19) Cyclobutane and butene 1 are


20) The number of possible isomers of a disubstituted benzene is


21) Among the following the one which does not exhibit functional group isomerism is


22) Buta -1, 3 - diene and but - 2 - yne are


23) The compound which forms one monochloro product when treated with chlorine is


24) Nitroethane can exhibit one of the following kind of isomerism


25) Cyanides and isocyanides are isomers of the type


26) Isomers of propionic acid are


27) 1 - Chloropropane and 2 - chloropropane are


28) Tautomerism is exhibited by


29) Which of the following is an isomers of propanal?


30) Which of the following is not isomeric with diethyl ether?


31) In the Keto - enol tautomerism of dicarbonyl compounds the enol form is preferred in contrast to the Keto form, this is due to


32) Which are isomers?


33) Which of the following compounds will show metamerism?


34) An isomer of ethanol is


35) The enolic form of acetone contains.


36) Keto - enol tautomerism is observed in


37) Optical isomerism arises due to the presence of


38) The optically active compound is


39) 2 - Methylpenta - 2, 3 - diene is achiral because it has


40) The angle of rotation of plane of polarised light depends upon


41) The racemisation of optically active compounds is driven by


42) Meso - tartaric acid is optically inactive due to the presence of


43) The production of an optically active compound from a symmetric molecule without resolution is termed


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


45) Dichloroethylene shows


46) Which of the following may exist as enantiomorphs?


47) Which of the following is optically active?


48) A compound contains 2 dissimilar asymmetric carbon atoms. The number of optically active isomers is


49) Which of the following structures permits cis-trans isomerism ?


50) Geometrical isomerism is caused


51) An optically active compound is


52) The maximum number of stereoisomers possible for 3-hydroxy - 2 - methylbutanoic acid is


53) Which of the following compounds can exhibit optical isomerism ?


54) Geometrical isomerism can exist only when the molecule


55) Number of possible isomers of glucose are


56) Which of the following does not show stereoisomerism


57) Two geometrical isomers are given by the following compound


58) Maleic and fumaric acids are


59) The change in optical rotation with time of freshly prepared solution of sugar is known as


60) d- Tartaric acid and l - tartaric acid are


61) Which of the following acids shows stereoisomerisms ?


62) Which of the following would show configurational enantiomorphism. ?


63) Optically active isomers are also called


64) Which class of compounds can exhibit geometrical isomerism ?


65) The arrangement of atoms that characteristics a particular stereoisomer is called


66) The reason of the loss of optical activity of lactic acid when OH group is changed by H, is that


67) Which is incorrect about enantiomorphs ?


68) Compounds whose molecules are super imposable on their mirror images even though they contain asymmetric carbon atoms or chiral centres are known as


69) A racemic mixture is a mixture of


70) Isopentane can form four Isomeric monobromo derivatives. How many of them are optically active ?


71) Lactic acid shows optical activity in


72) Which of the following compounds exhibits geometrical isomerism ?


73) Which one of the marked carbon is the asymmetric one?


74) Eclipsed and staggered forms of n-butane are called a pair of


75) The least energetic conformation of cyclohexane is


76) Which one of the following is the most stable structure of cyclohexatriene ?


77) In butane, which of the following form has the lowest energy ?


78) Diastereomers can be separated by


79) Which type of strain is present in fully eclipsed conformation of butane


80) Stereoisomerism can be exhibited by compounds having


81) Which of the following compound is not chiral ?


82) Which is the chiral molecule ?


83) A molecule is said to be chiral if it


84) The chiral compound is


85) Which of the following will show geometrical isomerism ?


86) Benzaldoxime exists in how many forms ?


87) The geometrical isomerism is shown by


88) R and S pairs of enantiomers differ from one another in


89) Which of the following pairs of compounds are enantiomers ?


90) Which of the following is an optically active compound ?


91) Which of the following exhibit zero dipole moment ?


92) The compound having highest dipole moment is


93) Which of the following Fischer's projection formula is identical to D-glyceraldehyde ?


94) What is the order of stability for
I. 1 - butene
II. cis - 2 - butene
III. trans - 2 - butene?


95) The compound without a chiral atom is


96) Geometrical isomerism is shown by


97) Which one of the following compounds will not exhibit optical isomerism ?


98) The least number of carbon atoms in alkane forming optical isomer is


99) Which of the following compounds will exhibit geometrical isomerism ?


100) An organic compound will show optical isomerism if


101) Optically active isomers but not mirror images are called


102) Which of the following molecule contains asymmetric carbon atom ?


103) Geometrical isomers differ in


104) Which of the following does not show geometrical isomerism ?


105) A similarity between optical and geometrical isomerism is that


106) Which of the following compounds is not chiral ?


107) Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is


108) Which of the following has least hindered rotations carbon-carbon bond ?


109) Isomers which can be interconverted through rotation around a single bond are


110) An organic molecule necessarily shows optical activity if it


111) The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methylbutane is


112) The optically active trataric acid is named as D-(+)-tartaric acid because it has a positive


113) Which of the following exhibits stereoisomerism


114) Which of the following compounds will exhibit geometrical isomerism ?


115) Which of the following has the lowest dipole moment ?


116) An enantiomerically pure acid is treated with a racemic mixture of an alcohol having one chiral carbon. The ester formed will be


117) Which of the following statements is not true about enantiomers


118) Rotation of plane polarised light can be measured by


119) How many chiral isomers can be drawn from 2-bromo-3chorobutane ?


120) Nitroethane can exhibit one of the following kind of isomerism


121) Increasing of order of stability among the three main conformations ( i.e. eclipse, anti, gauche ) of 2 - fluroethanol is


122) Which one of the following conformations of cyclohexane is chiral ?


123) Which of the following molecules is expected to rotate the plane-polarised light?


124) The alkene that exhibits geometrical isomerism is