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IIT JEE Fundamental Concepts Of Organic Chemistry
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IIT JEE Fundamental Concepts Of Organic Chemistry
1
An electrophile is a/an
A
Lewis base
B
Lewis acid
C
electron deficient species
D
Both A and B
2
Geometrical isomerism exist due to the presence of
A
single bond between C and C
B
double bond between C and C
C
triple bond between C and C
D
All the above
3
In the case of o-chlorophenol there exist
A
intramolecular hydrogen bonding
B
intermolecular covalent bonding
C
no hydrogen bonding
D
both inter and intramolecular hydrogen bonding
4
In isopentane the number of secondary carbon atom is12
A
1
B
2
C
3
D
0
5
Carbocation (or carbonium ion) is
A
a set of carbon atoms
B
an electrophile
C
a free radical
D
a nucleophile
6
Carbonium ions contain only??.electrons around the carbon core.2659
A
2
B
6
C
5
D
9
7
Carboxylic acids are isomeric withacid anhydrides
A
amines
B
esters
C
aldehydes
D
acid anhydrides
8
.Two or more compounds having the same number and kind of atoms and same molecular weight are called
A
isobars
B
isotones
C
isomers
D
isochors
9
.The process of separating a racemic mixture into optical isomers is known as
A
dissolution
B
isomerisation
C
resolution
D
pasteurization
10
Sulphur trioxide isa base
A
a Lewis base
B
a base
C
nucleophile
D
an electrophile
11
.In neopentane the number of primary carbon atoms are
A
4
B
3
C
2
D
1
12
Which of the following type of isomerism is found in the members of the same homologous series?Metamerism
A
Functional isomerism
B
Position isomerism
C
Metamerism
D
None of these
13
Hetrolytic fission results in the formation of
A
electrophile
B
free radicals
C
electrophile and nucleophile
D
electrons
14
.In acetylene C-C-H bond angle is
A
144 degree
B
180 degree
C
90 degree
D
96 degree
15
The forces between the molecules of a non-polar compounds arehybrid forces
A
Van der Walls forces
B
ionic bonding
C
hybrid forces
D
dipole forces
16
Carbanions are isoelectronic with
A
ethers
B
alcohols
C
amines
D
carboxylic acids
17
Diethyl amine and methylk propylamines are
A
metamers
B
tautomers
C
dynamic isomers
D
optical isomers
18
Diethyl amine and methylk propylamines areANSWER : : metamers
A
metamers
B
tautomers
C
dynamic isomers
D
optical isomers
19
.The number of possible metamers of pentonone are513
A
5
B
1
C
3
D
6
20
The tetrahedral nature of the carbon was given by
A
Vant Hoff
B
Lewis
C
Le-Bel and Vant Hoff
D
None of the above
21
.The tetrahedral nature of the carbon was given by
A
Vant Hoff
B
Lewis
C
Le-Bel and Vant Hoff
D
None of the above
22
Decomposition of a compound by the action of heat is known as
A
decomposition
B
knocking
C
smelting
D
pyrolysis
23
The most volatile amongst the following is
A
p-nitrophenol
B
m-nitrophenol
C
o-nitrophenol
D
none of these
24
.Different arrangement of atoms that can be converted into one another by rotation about single bonds are calledconformation
A
trans-isomers
B
conformation
C
enantiomers
D
None of these
25
A nucleophile is a
A
Lewis base
B
Lewis acid
C
neither a Lewis acid nor a Lewis base
D
both A & B
26
Chain isomers differ w.r.t.
A
position of substituent
B
position of functional group
C
chemical effect
D
root word
27
Alcohols are isomeric with
A
ketones
B
ethers
C
amines
D
acids
28
.The total no. of possible isomers of ethane are
A
10
B
20
C
4
D
infinite
29
Which of the following carbonium ions is the most stable?
A
triphenyl methyl
B
diphenyl methyl
C
benzyl
D
All the above
30
.Liquids whose molecules are held together by hydrogen bonds are called
A
associated liquids
B
aprotonic solvents
C
primary liquid
D
hydrated liquids
31
In substitution reactions of tertiary halide the ionisation of halogen atom as negative ion is facilitated by
A
electron attracting group
B
electron repelling group
C
free radical
D
All the above
32
Which of the following represents the iso-butyl radical ?
A
Ethane
B
Methane
C
Ethyne
D
Benzene.
33
Which of the following has zero dipole moment ?
A
1-Butene
B
cis-2-Butene
C
trans-2-Butene
D
2-Methyl-1-propene.
34
Which of the following alkanes has neither secondary nor tertiary hydrogens?neo-Pentane.
A
iso-Butane
B
iso-Pentane
C
Pentane
D
neo-Pentane.
35
.The no. of possible isomers of 1 2 dichloroethane are
A
2
B
3
C
4
D
infinite
36
he IUPAC name of isoprene is
A
1 3-Butadiene
B
2-Methyl-1 3-butadiene
C
2-Methyl-1-butene
D
3-Methyl-1-butene.
37
.Which of the following compounds is chiral?
A
2 chloro 2 methyl butane
B
3 chloro hexane
C
2 chloro pentane
D
1-chloro pentane
38
The IUPAC name of crotyl chloride is
A
1-Chloro-1-butene
B
1-Chloro-2-butene
C
2-Chloro-2-butene
D
3-Chloro-1-butene.
39
The secondary suffix in the IUPAC names of ketones is----
A
al
B
one
C
ol
D
oate.
40
Which of the following is optically active?
A
isobutyl alcohol
B
sec butyl alcohol
C
tert butyl alcohol
D
p-butyl alcohol
41
IUPAC name of propargyl alcohol is
A
Prop-2-yn-1-ol
B
Prop-2-en-1-ol
C
Prop-1-en-2-ol
D
Prop-1-yn-2-ol.
42
The number of pi bonds in isoprene is2310.
A
2
B
3
C
1
D
0
43
Molecules that are not superimposable on their mirror images aresymmetric
A
achiral
B
symmetric
C
asymmetric
D
chiral
44
In 19. In iso-octane (2 2 4-trimethylpentane) the number of tertiary hydrogen atoms is
A
One
B
Two
C
Three
D
Four.
45
Paraffins is the common name used for
A
Alkanes
B
Alkenes
C
Alkynes
D
Arenes.
46
.In iso-octane (2 2-4-trimethylpentane) the number of primary hydrogen atoms is
A
12
B
15
C
13
D
14
47
.Which of the following molecules does not contains any secondary hydrogen atom?
A
n-Pentane
B
neo-Pentane
C
neo-Hexane
D
iso-Pentane.
48
Diastereomers are a pair
A
stereoisomers that cannot be separated from each other
B
stereoisomers that are not minor image of each other
C
stereoisomers that have identical chemical properties
D
stereoisomers that are minor image of each other
49
.Which of the following have zero dipole moment?
A
2 methyl propane
B
trans-2 butene
C
cis-2 butene
D
butane-1
50
All the members of a homologous series have same
A
Molecular mass
B
Molecular formula
C
Empirical formula
D
General molecular formula.
51
The IUPAC name of allylene is
A
Propyne
B
Propene
C
2-Butyne
D
1-Butyne.
52
Which of the following is the functional isomer of methyl acetate?
A
Ethyl acetate
B
Propanoic acid
C
Ethyl formate
D
Propanone.
53
Which of the following compounds contains maximum number of tertiary hydrogen atoms?
A
n-Hexane
B
2-2-Dimethylbutane
C
2 3-Dimethylbytene
D
2-Metylpentane.
54
The IUPAC name of crotyl chloride is
A
1-Chloro-1-butene
B
1-Chloro-2-butene
C
2-Chloro-2-butene
D
3-Chloro-1-butene.
55
.What is not truen about homologous series ?
A
All the members have similar chemical properties
B
They have identical physical properties
C
They can be represented by a general formula
D
Adjacent members deiffer in molecular mass by 14.
56
What is not true about homologous series?Adjacent members differ in molecular mass by 14.
A
All the members have similar chemical properties
B
They have identical physical properties
C
They can be represented by a general formula
D
Adjacent members differ in molecular mass by 14.
57
.Optical activity in a compound can be detected by means of
A
voltmeter
B
potentiometer
C
ammeter
D
polarimeter
58
.Which of the following compounds has least dipole moment?
A
1 2-Dichlorobenzene
B
1 3-Dichlorobenzene
C
1 4-Dichlorobenzene
D
All have same dipole moment.
59
.An example of cinjugated diene is1 4-Pentadiene
A
1 4-Pentadiene
B
1 5-Hexadiene
C
1 2-Butadiene
D
1 3-Pentadiene.
60
Number of sec-H atoms in iso-butane is
A
1
B
9
C
4
D
none.
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