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Isomerism - 2 - JEE MCQ

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30 Questions MCQ Test - Isomerism - 2

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Isomerism - 2 - Question 1

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Which point on the potential energy diagram is represented by Newman projection shown here ?

A.
P
B.
Q
C.
R
D.
S

Detailed Solution for Isomerism - 2 - Question 1

Gauche form

Isomerism - 2 - Question 2

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A.
5
B.
4
C.
2
D.
3

Detailed Solution for Isomerism - 2 - Question 2

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Isomerism - 2 - Question 3

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Which of the following compounds exhibits stereoisomerism ?

A.
2-methylbutene-1
B.
3-methylbutyne-1
C.
3-methylbutanoic acid
D.
2-methylbutanoic acid

Detailed Solution for Isomerism - 2 - Question 3

Isomerism - 2 - Question 4

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The most stable conformation of 3-fluorobutan-2-ol is :

A.
Fully eclipsed form
B.
Partially eclipsed form
C.
Gauche form
D.
Anti form .

Detailed Solution for Isomerism - 2 - Question 4

Isomerism - 2 - Question 5

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Observe the following structures I to III

Correct statement is :

A.
All three are chiral compounds
B.
I & II are chiral
C.
Only II is chiral
D.
Only III is chiral

Detailed Solution for Isomerism - 2 - Question 5

Only III has chiral centre and disymmetry.

Isomerism - 2 - Question 6

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The general formula C_nH_2nO₂ could be for open chain

A.
diketones
B.
carboxylic acids
C.
diols
D.
dialdehydes

Detailed Solution for Isomerism - 2 - Question 6

Isomerism - 2 - Question 7

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S₁ : When value of dihedral angle is 180º then this conformation is called anti conformation ?
S₂ : When ϕ = 60º then this conformation is called gauche.
S₃ : When ϕ = 0º then this conformation is called eclipsed conformation.
S₄ : Other than staggered and eclipsed are called skew conformation

A.
T T T T
B.
F F F F
C.
T F T F
D.
F F T T

Detailed Solution for Isomerism - 2 - Question 7

Isomerism - 2 - Question 8

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Which of the following structures are superimposable (identical) ?

A.
I and II
B.
II and III
C.
I and IV
D.
I and III

Detailed Solution for Isomerism - 2 - Question 8

Structure (I) and (III) both have same configuration (S, R) and they are super imposable.

Isomerism - 2 - Question 9

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The pair of compounds having the same general formula.

Detailed Solution for Isomerism - 2 - Question 9

Isomerism - 2 - Question 10

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The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C₄H₆is / are :

A. 5
B. ERROR
C. ERROR
D. ERROR

Detailed Solution for Isomerism - 2 - Question 10

Isomerism - 2 - Question 11

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Which will show geometrical isomerism ?

A.
I, II, III, IV
B.
I, II, III
C.
I, III, IV
D.
II, III, IV

Detailed Solution for Isomerism - 2 - Question 11

Follow conditions of geometrical isomerism.

Isomerism - 2 - Question 12

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Total number of stereoisomer of compound is :

A.
2
B.
4
C.
6
D.
8

Detailed Solution for Isomerism - 2 - Question 12

Isomerism - 2 - Question 13

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Which type of isomerism is observed between I and II ?

A.
Functional isomerism
B.
Metamerism
C.
Optical isomerism
D.
Geometrical isomerism

Detailed Solution for Isomerism - 2 - Question 13

There is change in C skeleton across the functional group.

Isomerism - 2 - Question 14

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The correct relationship among the following pairs of given compounds is -

A.
(I, II) (II, III)
Functional Isomers Metamers
B.
(I, II) (II, III)
Metamers Functional isomers
C.
(I, II) (II, III)
Metamers Metamers
D.
(I, II) (II, III)
Functional Isomers Functional isomers

Detailed Solution for Isomerism - 2 - Question 14

I, II & III are metamers because functional group is diester & there is only change in alkyl group attachment.

Isomerism - 2 - Question 15

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The total number of cyclic structural as well as stereo isomers possible for a compound with the molecular formula C₅H₁₀ is

A. 7
B. ERROR
C. ERROR
D. ERROR

Detailed Solution for Isomerism - 2 - Question 15

Isomerism - 2 - Question 16

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The dihedral angle between two methyl groups in partially eclipsed conformation of n-butane is

A.
180⁰
B.
120⁰
C.
90⁰
D.
109⁰ 28'

Detailed Solution for Isomerism - 2 - Question 16

Isomerism - 2 - Question 17

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What is the degree of unsaturation in a compound with molecular formula C₉H₆N₄?

A. 9
B. ERROR
C. ERROR
D. ERROR

Detailed Solution for Isomerism - 2 - Question 17

Isomerism - 2 - Question 18

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Which compound is not the isomer of 3-Ethyl-2-methylpentane ?

Detailed Solution for Isomerism - 2 - Question 18

Isomerism - 2 - Question 19

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Which of the following shows functional isomerism ?

A.
CH₃CH₂Cl and CH₃CH₂Br
B.
CH₃CH₂Br and CH₂BrCH₂Br
C.
C₂H₅OC₂H₅ and CH₃OC₃H₇
D.
H₃CH₂CHO and CH₃COCH₃

Detailed Solution for Isomerism - 2 - Question 19

Aldehyde and Ketone are functional isomers.

Isomerism - 2 - Question 20

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Which of the following compound has 'D' configuration ?

Detailed Solution for Isomerism - 2 - Question 20

Isomerism - 2 - Question 21

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Detailed Solution for Isomerism - 2 - Question 21

Isomerism - 2 - Question 22

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The instrument which can be used to measure optical activity, i.e., specific rotation:

A.
Refractometer
B.
Photometer
C.
Voltmeter
D.
Polarimeter

Detailed Solution for Isomerism - 2 - Question 22

Self explanatory

Isomerism - 2 - Question 23

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Which point on the potential energy diagram is represented by Newman projection shown here ?

A.
P
B.
Q
C.
R
D.
S

Detailed Solution for Isomerism - 2 - Question 23

Gauche form

Isomerism - 2 - Question 24

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A.
5
B.
4
C.
2
D.
3

Detailed Solution for Isomerism - 2 - Question 24

Isomerism - 2 - Question 25

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Which of the following compounds exhibits stereoisomerism ?

A.
2-methylbutene-1
B.
3-methylbutyne-1
C.
3-methylbutanoic acid
D.
2-methylbutanoic acid

Detailed Solution for Isomerism - 2 - Question 25

Isomerism - 2 - Question 26

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The general formula C_nH_2nO₂ could be for open chain

A.
diketones
B.
carboxylic acids
C.
diols
D.
dialdehydes

Detailed Solution for Isomerism - 2 - Question 26

Isomerism - 2 - Question 27

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A.
T T T T
B.
F F F F
C.
T F T F
D.
F F T T

Detailed Solution for Isomerism - 2 - Question 27

Isomerism - 2 - Question 28

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The pair of compounds having the same general formula.

Detailed Solution for Isomerism - 2 - Question 28

Isomerism - 2 - Question 29

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The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C₄H₆is / are :

A. 5
B. ERROR
C. ERROR
D. ERROR

Detailed Solution for Isomerism - 2 - Question 29

Isomerism - 2 - Question 30

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Which will show geometrical isomerism ?

A.
I, II, III, IV
B.
I, II, III
C.
I, III, IV
D.
II, III, IV

Detailed Solution for Isomerism - 2 - Question 30

Follow conditions of geometrical isomerism.

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