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NEET Chemistry MCQ
Isomerism And Steroisomerism Mcq Neet Chemistry
Quiz 4
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Q.1
Consider the following reaction and statements : [Co(NH3)4Br2]+ + Br– → [Co(NH3)3Br3] + NH3 (I) Two isomers are produced if the reactant complex ion is a cis-isomer. (II) Two isomers are produced if the reactant complex ion is a trans-isomer. (III) Only one isomer is produced if the reactant complex ion is a trans-isomer. (IV)Only one isomer is produced if the reactant complex ion is a cis-isomer. The correct statements are : IIT mains 2018]
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a) (I) and (III)
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b) (III) and (IV)
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c) (II) and (IV)
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d) (I) and (II)
Explanation
Answer:(a)
Q.2
Which of the following will show geometrical isomerism? [ DPMT 2001]
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b) 1,2-Dibromobutene
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a) 1-Butene
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c) Propene
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d) Isobutylene
Explanation
1, 2-Dibromobutene has different substituents on each C-atom of the doublebond and henceshows geometrical isomerism Answer:(b)
Q.3
In the boat conformation of cyclohexane, the most destabilizing interaction is ...
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a) Eclipsing
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b) 1, 3-Diequatorial
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c) 1,3-Diaxial
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d) Flagpole-Flagpole
Explanation
Boat conformermation of cyclohexane has two types of destabilizing interaction, i.e. eclipsing and flagpole - flagpole. Out of these eclipsing interactions are the most destabilizing. Answer:(a)
Q.4
ionParagraph question P and Q are isomers of dicarboxylic acid C4H4OBoth decolorize Br2 / H2O. On heating , P forms the cyclic anhydride. Upon treatment with dilute alkaline KMnO4 , P as well as Q could produce one or more than one from S, T and U. Q94) Compounds formed from P and Q are , respectively
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a) Optically active S and optically active pair (T, U)
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b) Optically inactive S and optically inactive pair (T, U)
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c) Optically active pair (T, U) and optically active S
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d) Optically inactive pair (T, U) and optically inactive S.
Explanation
Answer:(b)
Q.5
n-Propyl alcohol and isopropyl alcohol are examples of ... [ BHU 1994]
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a) Position isomers
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b) Chain isomerism
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c) Tautomerism
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d) Geometrical isomerism
Explanation
Answer:(a)
Q.6
ion Q97) The absolute configuration of the following compound is ...[ AIIMS 2003]
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a) 2S, 3R
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b) 2S,3S
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c) 2R, 3S
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d) 2R, 3R
Explanation
Follow the procedue under 'Golden Rule' the absolute configuration is 2S, 3S Answer:(b)
Q.7
ion Q98) When the following aldohexose exists in its D configuration, the total number of stereoisomers in its pyranose form is
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a) 1
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b) 4
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c) 6
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d) 8
Explanation
Three chiral centre 23 = 8D Configuration and also 8 L Configuration Answer:(d)
Q.8
ion Q99) The total number(s) of stable conformers with non-zero dipole moment for the following compound is (are) ..[ IIT advance2014]
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a) 1
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b) 2
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c) 3
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d) 4
Explanation
Answer:(c)
Q.9
Which one of the following is the stablest structurte of cyclohexatriene? ...[ AIIMS 1994]
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a) Chair form
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b) Boat form
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c) Halfchair form
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d) Planar form
Explanation
Answer:(d)
Q.10
on Q101) The total number of stereoisomers that can exist for M is [IIT advance 2015]
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a) 1
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b) 2
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c) 8
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d) 6
Explanation
Compound M have ‘2’ stereo centres. Answer:(b)
Q.11
Which of the following compounds will show metemerism? ...[ Hariyamna CEET 1996]
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a) CH3 - CO - C2H5
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b) C2H5 - S - C2H5
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c) CH3 - O - CH3
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d) CH3 - O - C2H5
Explanation
Answer:(b)
Q.12
Compound(s) that on hydrogenation produce(s) optically inactive compound(s) is(are)
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a)
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b)
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c)
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d)
Explanation
Due to planer synnety optically inactive Answer:(b, d)
Q.13
The number of geometrical isomers of ... [ Manipal PMT 1999] CH3CH = CH - CH = CH - CH = CHCl is
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a) 2
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b) 4
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c) 6
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d) 8
Explanation
Since both the carbon atoms of each of the three double bonds are differently substitutes, therefore 23= 8 geometrical isomersare possible Answer:(d)
Q.14
on Q105) The structure of D-(+)-glucose is What is the structure of L-(+)-glucose
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a)
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b)
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c)
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d)
Explanation
configuration with –OH group at right side was given D-configuration where as the configuration with –OH group at left side was given L-configuration. the configuration of stereocentre farthest from carbonyl group is compared with glyceraldehydes Answer:(a)
Q.15
How many stereoisomers are therefor tartaric acid?
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a) 2
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b) 3
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c) 4
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d) 5
Explanation
d-tartaric acid, l-tartaric acid,meso-tartaric acid Answer:(b)
Q.16
Which of the following complex species is not expected to exhibit optical isomerism ? [ IIT Main 2013 ]
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a) [Co(en)3]3+
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b) [Co(en)2Cl2]+
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c) [Co(NH3)3Cl3]
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d) [Co(en)(NH3)2Cl2]+
Explanation
[Co(NH3)3Cl3] will not exhibit optical isomerism due to presence of plane of symmetr Answer:(c)
Q.17
The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH3) (NH2OH)]+ is (py = pyridine ) [ IIT Main 2015]
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a) 2
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b) 3
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c) 4
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d) 6
Explanation
We know that complex of MABCD where M being metal and A, B, C, D = ligands can have 3 geometrical isomers. Here M = Pt A = Cl B =py C=NH3 D=NH2OH Answer:(b)
Q.18
on Q110) In the following structures, which two forms are staggered conformation of ethane?
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a) 1 and 4
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b) 2 and 3
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c) 1 and 2
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d) 1 and 3
Explanation
Answer:(c)
Q.19
Which of the following compounds will exhibit geometrical isomerism? [ IIT2000]
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a) 1-Phenyl-2-butene
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b) 3-Phenyl-1-butene
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c) 2-Phenyl-1-butene
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d) 1,1-Diphenyl-1-propene
Explanation
Both the C-atoms of the doubled bond 1-Phenyl-2-butene (C6H5CH2-CH =CH - CH3) carry different substituents and hence it shows geometrical isomerism Answer:(a)
Q.20
Which of the following compounds will exhibit geometrical isomerism? [ IIT 2015]
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a) 1 - Phenyl - 2 - butene
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b) 3 - Phenyl - 1- butene
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c) 2 - Phenyl - 1- butene
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d) 1, 1 - Diphenyl - 1 - propane
Explanation
We know that for Geometrical Isomer we need a double bond between carbon atom (this restricts rotation) and carbon atom at two sides must be linked to two different groups. Answer:(a)
Q.21
Tautomerismwill be exhibited by ..[CBSE PMT 1997]
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a) (CH3)3CNO
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b) (CH3)2NH
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c) R3CNO2
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d) RCH2NO2
Explanation
only RCH2NO2 has α-hydrogen atomshence shows tautomerism Answer:(d)
Q.22
How many chiral carbon atoms are present in 2,3,4-trichloropentane? [ IIT1990]
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a) Three
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b) Two
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c) One
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d) Four
Explanation
Answer:(a)
Q.23
on Q116) The absolute configuration of ..
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a) (2R, 3S)
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b) (2S, 3R)
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c) (2S, 3S)
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d) (2R, 3R)
Explanation
Follow the procedure under"Golden Rule" Answer:(b)
Q.24
The total number of isomers for C4H8 is ...[ AIIMS 1996]
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a) 5
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b) 6
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c) 7
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d) 8
Explanation
1. 1-butene, 2. trans-2-butene, 3.cis-2-butene, 4.2-methyl popene, 5. Cyclobutane, 6.Methylcyclopropane Answer:(b)
Q.25
Thenumber of optical isomers formed by hydrogenationof the compound, (CH3)2C = CHCH3 are ..[ BHU 2000]
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a) 1
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b) 2
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c) 3
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d) zero
Explanation
Answer:(d)
Q.26
The number of possible acyclic structureal isomers of C4H10O is ...[ MPPMT 1998]
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a) 5
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b) 6
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c) 7
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d) 8
Explanation
Four alcohols : 1-butanol,2-butanol, 2-methyl-1-propanol and 2-methyl-2-propanol Three ethers: CH3OCH2CH2CH3,CH3-O-CH(CH3)2 and CH3CH2OCH2CH3 Answer:(c)
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