Some Basic Concepts of Organic Chemistry
101 Questions
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2015
Q51
NEET
MCQ
10 Mar 2026
The total number of $\pi $-bond electrons in the following structure is
A.
12
B.
16
C.
4
D.
8
2015
Q52
NEET
MCQ
10 Mar 2026
Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?
A.
B.
C.
D.
2015
Q53
NEET
MCQ
10 Mar 2026
Consider the following compounds :
Hyperconjunction occurs in
Hyperconjunction occurs in
A.
III only
B.
I and III
C.
I only
D.
II only
2015
Q54
NEET
MCQ
10 Mar 2026
The enolic form of ethyl accetoacetate as shown below has
A.
9 sigma bonds and 2 pi-bonds
B.
9 sigma bonds and 1 pi-bond
C.
18 sigma bonds and 2 pi-bonds
D.
16 sigma bonds and 1 pi-bond.
2015
Q55
NEET
MCQ
10 Mar 2026
In which of the following compounds, the C$-$Cl bond ionisation shall give most stable carbonium ion?
A.
B.
C.
D.
2015
Q56
NEET
MCQ
10 Mar 2026
In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is
A.
16.75
B.
15.76
C.
17.36
D.
18.20
2014
Q57
NEET
MCQ
10 Mar 2026
In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is
A.
37.33
B.
45.33
C.
35.33
D.
43.33
2013
Q58
NEET
MCQ
10 Mar 2026
What is the hybridisation state of benzyl carbonium ion?
A.
sp2
B.
spd2
C.
sp2d
D.
sp3
2013
Q59
NEET
MCQ
10 Mar 2026
Given :
I and II are
I and II are
A.
identical
B.
a pair of conformers
C.
a pair of geometrical isomers
D.
a pair of optical isomers
2013
Q60
NEET
MCQ
10 Mar 2026
Which of the following chemical system is non aromatic ?
A.
B.
C.
D.
2013
Q61
NEET
MCQ
10 Mar 2026
Arrange the following in increasing order of stability
A.
5 < 4 < 3 < 1< 2
B.
4 < 5 < 3 < 1 < 2
C.
1 < 5 < 4 < 3 < 2
D.
5 < 4 < 3 < 2 < 1
2013
Q62
NEET
MCQ
10 Mar 2026
Homolytic fission of the following alkanes forms free radicals CH3 $-$ CH3, CH3 $-$ CH2 $-$ CH3, (CH3)2CH $-$ CH3, CH3 $-$ CH2 $-$CH(CH3)2.
Increasing order of stability of the radicals is
Increasing order of stability of the radicals is
A.
$\eqalign{
& {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - \,C{H_2}C{H_3}\, < C{H_3}\, - \,\mathop C\limits^ \bullet H - \,C{H_3} \cr
& < C{H_3}\, - \,\mathop C\limits^ \bullet {H_2}\, < {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \cr} $
B.
$\eqalign{
& C{H_3}\, - \,\mathop C\limits^ \bullet {H_2}\, < \,C{H_3}\, - \,\mathop C\limits^ \bullet HH\, - \,C{H_3}\, < \cr
& {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - \,C{H_2}\, - \,C{H_3}\, < \,{\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \cr} $
C.
$\eqalign{
& C{H_3} - \mathop C\limits^ \bullet {H_2} < C{H_3} - \mathop C\limits^ \bullet H - C{H_3} < \cr
& {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \, < {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - C{H_2}C{H_3} \cr} $
D.
$\eqalign{
& {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet \, < {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet \, - C{H_2}C{H_3} < \cr
& C{H_3} - \mathop C\limits^ \bullet H - C{H_3} < C{H_3} - \mathop C\limits^ \bullet {H_2} \cr} $
2013
Q63
NEET
MCQ
10 Mar 2026
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?
A.
$-$COOH
B.
$-$ NO2
C.
$-$ C $ \equiv $ N
D.
$-$ SO3H
2013
Q64
NEET
MCQ
10 Mar 2026
Structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is
A.
B.
C.
D.
2013
Q65
NEET
MCQ
10 Mar 2026
The radical,
is aromatic because it has
is aromatic because it has
A.
7 p-orbitals and 7 unpaired electrons
B.
6 p-orbitals and 7 unpaired electrons
C.
6 p-orbitals and 6 unpaired electrons
D.
7 p-orbitals and 6 unpaired electrons.
2013
Q66
NEET
MCQ
10 Mar 2026
The structure of isobutyl group in an organic compound is
A.
B.
C.
D.
2012
Q67
NEET
MCQ
10 Mar 2026
Which nomenclature is not according to IUPAC system?
A.
B.
C.
D.
2012
Q68
NEET
MCQ
10 Mar 2026
Which of the following acids does not exhibit optical isomerism?
A.
Maleic acid
B.
$\alpha $-amino acids
C.
Lactic acid
D.
Tartaric acid
2011
Q69
NEET
MCQ
10 Mar 2026
The IUPAC name of the following compound is
A.
trans-2-chloro-3-iodo-2-pentene
B.
cis-3-iodo-4-chloro-3-pentane
C.
trans-3-iodo-4-chloro-3-pentene
D.
cis-2-chloro -3-iodo-2-pentene.
2011
Q70
NEET
MCQ
10 Mar 2026
Considering the state of hybridization of carbon atoms, find out the molecule among the following which is linear ?
A.
CH3 $-$ CH $=$ CH $-$ CH3
B.
CH3 $-$ C$ \equiv $C $-$ CH3
C.
CH2 $=$ CH $-$ CH2 $-$ C$ \equiv $CH
D.
CH3 $-$ CH2 $-$ CH2 $-$ CH3
has sp
hybridized carbon atoms which has bond angle 180o are attached to sp3
hybridised carbon atoms. So, it is linear.
2011
Q71
NEET
MCQ
10 Mar 2026
Which one of the following is most reactive towards electrophilic reagent?
A.
B.
C.
D.
2011
Q72
NEET
MCQ
10 Mar 2026
The correct IUPAC name for the compound is
A.
4-ethyl-3-propylhex-1-ene
B.
3-ethyl-4-ethenylheptane
C.
3-ethyl-4-propylhex-5-ene
D.
3-(1 -ethylpropyl)hex- 1 -ene.
2010
Q73
NEET
MCQ
10 Mar 2026
Which of the following conformers for ethylene glycol is most stable?
A.
B.
C.
D.
2010
Q74
NEET
MCQ
10 Mar 2026
Which of the following species is not electrophilic in nature?
A.
$\mathop C\limits^ + l$
B.
BH3
C.
H3$\mathop O\limits^ + $
D.
$\mathop N\limits^ + $O2
2010
Q75
NEET
MCQ
10 Mar 2026
The IUPAC name of the compound
CH3CH$=$CHC$ \equiv $CH is
CH3CH$=$CHC$ \equiv $CH is
A.
pent-4-yn-2-ene
B.
pent-3-en-1-yne
C.
pent-2-en-4-yne
D.
pent-1-yn-3-ene
2010
Q76
NEET
MCQ
10 Mar 2026
In the following the most stable conformation of n-butane is
A.
B.
C.
D.
2010
Q77
NEET
MCQ
10 Mar 2026
Which one of the following is most reactive towards electrophilic reagent?
A.
B.
C.
D.
2009
Q78
NEET
MCQ
10 Mar 2026
The IUPAC name of the compound having the formula
CH$ \equiv $C$-$CH$=$CH2 is
CH$ \equiv $C$-$CH$=$CH2 is
A.
1-butyne-3-ene
B.
but-1-yne-3-ene
C.
1-butene-3-yne
D.
3-butene-1-yne.
2008
Q79
NEET
MCQ
10 Mar 2026
Base strength of
is in the order of
is in the order of
A.
(i) > (iii) > (ii)
B.
(i) > (ii) > (iii)
C.
(ii) > (i) > (iii)
D.
(iii) > (ii) > (i)
2008
Q80
NEET
MCQ
10 Mar 2026
The stability of carbanions in the following.
is in the order of
is in the order of
A.
(iv) > (ii) > (iii) > (i)
B.
(i) > (iii) > (ii) > (iv)
C.
(i) > (ii) > (iii) > (iv)
D.
(ii) > (iii) > (iv) > (i)
2008
Q81
NEET
MCQ
10 Mar 2026
How many stereoisomers does this molecule have?
CH3CH$=$CHCH2CHBrCH3
CH3CH$=$CHCH2CHBrCH3
A.
8
B.
2
C.
4
D.
6
2008
Q82
NEET
MCQ
10 Mar 2026
Which one of the following is most reactive towards electrophilic attack?
A.
B.
C.
D.
2007
Q83
NEET
MCQ
10 Mar 2026
For (i) I$-$, (ii) Cl$-$, (iii) Br$-$, the increasing order of nucleophilicity would be
A.
Cl$-$ < Br$-$ < I$-$
B.
I$-$ < Cl$-$ < Br$-$
C.
Br$-$ < Cl$-$ < I$-$
D.
I$-$ < Br$-$ < Cl$-$
2007
Q84
NEET
MCQ
10 Mar 2026
The order of decreasing reactivity towards an electrophilic reagent, for the following would be
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol
A.
(ii) > (iv) > (i) > (iii)
B.
(iv) > (iii) > (ii) > (i)
C.
(iv) > (ii) > (i) > (iii)
D.
(i) > (ii) > (iii) > (iv)
2007
Q85
NEET
MCQ
10 Mar 2026
If there is no rotation of plane polarised light by a compound in a specific solvent, through to be chiral, it may mean than
A.
the compound is certainly meso
B.
there is no compound in the solvent
C.
the compound may be a racemic mixture
D.
the compound is certainly a chiral.
2006
Q86
NEET
MCQ
10 Mar 2026
The IUPAC name of
is
is
A.
1-chloro-1-oxo-2, 3-dimethylpentane
B.
2-ethyl-3-methylbutanoyl chloride
C.
2, 3-dimethylpentanoyl chloride
D.
3, 4-dimethylpentanoyl chloride.
2005
Q87
NEET
MCQ
10 Mar 2026
The chirality of the compound
A.
R
B.
S
C.
E
D.
Z
2005
Q88
NEET
MCQ
10 Mar 2026
Which one of the following pairs represents stereoisomerism?
A.
Structural isomerism and gemetrical isomerism
B.
Optical isomerism and geometrical isomerism
C.
Chain isomerism and rotational isomerism
D.
Linkage isomerism and geometrical isomerism.
2005
Q89
NEET
MCQ
10 Mar 2026
Which amongst the following is the most stable carbocation?
A.
$\mathop C\limits^ + $H3
B.
CH3$\mathop C\limits^ + $H2
C.
D.
2005
Q90
NEET
MCQ
10 Mar 2026
Names of some compounds are given. Which one is not in IUPAC system?
A.
B.
C.
D.
2005
Q91
NEET
MCQ
10 Mar 2026
The best method for the separation of naphthalene and benzoic acid from their mixture is
A.
distillation
B.
sublimation
C.
chromatography
D.
crystallisation.
2004
Q92
NEET
MCQ
10 Mar 2026
The molecular formula of diphenyl methane,
How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom ?
How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom ?
A.
6
B.
4
C.
8
D.
7
2003
Q93
NEET
MCQ
10 Mar 2026
Which of the following pairs of compounds are enantiomers?
A.
B.
C.
D.
2003
Q94
NEET
MCQ
10 Mar 2026
Name of the compound given below is
A.
4-ethyl-3-methyloctane
B.
3-methyl-4-ethyloctane
C.
2, 3-diethylheptane
D.
5-ethyl-6-methyloctane
2003
Q95
NEET
MCQ
10 Mar 2026
Which one of the following orders of acid strength is correct ?
A.
RCOOH > ROH > HOH > HC $ \equiv $ CH
B.
RCOOH > HOH > ROH > HC $ \equiv $ CH
C.
RCOOH > HOH > HC $ \equiv $ CH > ROH
D.
RCOOH > HC $ \equiv $ CH > HOH > ROH
2002
Q96
NEET
MCQ
10 Mar 2026
IUPAC name of the following is
CH2 $=$ CH $-$ CH2 $-$ CH2 $-$ C $ \equiv $ CH
CH2 $=$ CH $-$ CH2 $-$ CH2 $-$ C $ \equiv $ CH
A.
1-hexyne-5-ene
B.
1, 5 -hexenyne
C.
1-hexene-5-yne
D.
1,5-hexynene.
2002
Q97
NEET
MCQ
10 Mar 2026
Geometrical isomers differ in
A.
position of functional group
B.
position of atoms
C.
spatial arrangement of atoms
D.
length of carbon chain.
2001
Q98
NEET
MCQ
10 Mar 2026
In steam distillation of toluene, the pressure of toluene in vapour is
A.
equal to pressure of barometer
B.
Less than pressure of barometer
C.
equal to vapour pressure of toluene in simple distillation
D.
more than vapour pressure of toluene in simple distillation.
2001
Q99
NEET
MCQ
10 Mar 2026
The correct acidic order of the following is
A.
I > II > III
B.
III > I > II
C.
II > III > I
D.
I > III > II
2001
Q100
NEET
MCQ
10 Mar 2026
A compound of molecular formula C7H16 shows optical isomerism, compound will be
A.
2, 3-dimethylpentane
B.
2, 2-dimethylbutane
C.
2-methylhexane
D.
none of these
