2017
NEET
MCQ
NEET 2017
The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is
A.
chromatography
B.
crystallisation
C.
steam distillation
D.
sublimation.
2017
NEET
MCQ
NEET 2017
The IUPAC name of the compound
A.
5-formylhex-2-en-3-one
B.
5-methyl-4-oxohex-2-en-5-al
C.
3-keto-2-methylhex-5-enal
D.
3-keto-2-methylhex-4-enal
2016
NEET
MCQ
NEET 2016 Phase 2
Which among the given molecules can exhibit tautomerism?
A.
III only
B.
Both I and III
C.
Both I and II
D.
Both II and III
2016
NEET
MCQ
NEET 2016 Phase 1
The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is
A.
the eclipsed conformation of ethane is more stable than staggered conformation even through the eclipsed conformation has torsional strain
B.
the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
C.
the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
D.
the eclipsed conformation of ethane is more stable than stggered conformation, because eclipsed conformation has no torsional strain.
2015
NEET
MCQ
AIPMT 2015
Which of the following statements is not correct for a nucleophile?
A.
Ammonia is a nucleophile.
B.
Nucleophiles attack low e$-$ density sites.
C.
Nucleophiles are not electron seeking.
D.
Nucleophile is a Lewis acid.
2015
NEET
MCQ
AIPMT 2015
The possible stereo-structures of CH3CHOHCOOH, which are optically active, are called
A.
atropisomers
B.
enantiomers
C.
mesomers
D.
diastereomers
They are enantiomers (non-superimposable
mirror images)
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
Given :
Which of the given compounds can exhibit tautomerism?
Which of the given compounds can exhibit tautomerism?
A.
II and III
B.
I, II and III
C.
I and II
D.
I and III
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
The total number of $\pi $-bond electrons in the following structure is
A.
12
B.
16
C.
4
D.
8
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?
A.
B.
C.
D.
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
Consider the following compounds :
Hyperconjunction occurs in
Hyperconjunction occurs in
A.
III only
B.
I and III
C.
I only
D.
II only
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
The enolic form of ethyl accetoacetate as shown below has
A.
9 sigma bonds and 2 pi-bonds
B.
9 sigma bonds and 1 pi-bond
C.
18 sigma bonds and 2 pi-bonds
D.
16 sigma bonds and 1 pi-bond.
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
In which of the following compounds, the C$-$Cl bond ionisation shall give most stable carbonium ion?
A.
B.
C.
D.
2015
NEET
MCQ
AIPMT 2015 Cancelled Paper
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
NEET
MCQ
AIPMT 2014
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
NEET
MCQ
NEET 2013 (Karnataka)
What is the hybridisation state of benzyl carbonium ion?
A.
sp2
B.
spd2
C.
sp2d
D.
sp3
2013
NEET
MCQ
NEET 2013 (Karnataka)
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
NEET
MCQ
NEET 2013 (Karnataka)
Which of the following chemical system is non aromatic ?
A.
B.
C.
D.
2013
NEET
MCQ
NEET 2013 (Karnataka)
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
NEET
MCQ
NEET 2013 (Karnataka)
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
NEET
MCQ
NEET 2013
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
NEET
MCQ
NEET 2013
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
NEET
MCQ
NEET 2013
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
NEET
MCQ
NEET 2013
The structure of isobutyl group in an organic compound is
A.
B.
C.
D.
2012
NEET
MCQ
AIPMT 2012 Prelims
Which nomenclature is not according to IUPAC system?
A.
B.
C.
D.
2012
NEET
MCQ
AIPMT 2012 Prelims
Which of the following acids does not exhibit optical isomerism?
A.
Maleic acid
B.
$\alpha $-amino acids
C.
Lactic acid
D.
Tartaric acid
2011
NEET
MCQ
AIPMT 2011 Mains
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
NEET
MCQ
AIPMT 2011 Prelims
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
NEET
MCQ
AIPMT 2011 Prelims
Which one of the following is most reactive towards electrophilic reagent?
A.
B.
C.
D.
2011
NEET
MCQ
AIPMT 2011 Prelims
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
NEET
MCQ
AIPMT 2010 Mains
Which of the following conformers for ethylene glycol is most stable?
A.
B.
C.
D.
2010
NEET
MCQ
AIPMT 2010 Mains
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^ + $O2
2010
NEET
MCQ
AIPMT 2010 Mains
The IUPAC name of the compound
CH3CH$=$CHC$ \equiv $CH is
CH3CH$=$CHC$ \equiv $CH is
A.
pent-4-yn-2-ene
B.
pent-3-en-1-yne
C.
pent-2-en-4-yne
D.
pent-1-yn-3-ene
2010
NEET
MCQ
AIPMT 2010 Prelims
In the following the most stable conformation of n-butane is
A.
B.
C.
D.
2010
NEET
MCQ
AIPMT 2010 Prelims
Which one of the following is most reactive towards electrophilic reagent?
A.
B.
C.
D.
2009
NEET
MCQ
AIPMT 2009
The IUPAC name of the compound having the formula
CH$ \equiv $C$-$CH$=$CH2 is
CH$ \equiv $C$-$CH$=$CH2 is
A.
1-butyne-3-ene
B.
but-1-yne-3-ene
C.
1-butene-3-yne
D.
3-butene-1-yne.
2008
NEET
MCQ
AIPMT 2008
Base strength of
is in the order of
is in the order of
A.
(i) > (iii) > (ii)
B.
(i) > (ii) > (iii)
C.
(ii) > (i) > (iii)
D.
(iii) > (ii) > (i)
2008
NEET
MCQ
AIPMT 2008
The stability of carbanions in the following.
is in the order of
is in the order of
A.
(iv) > (ii) > (iii) > (i)
B.
(i) > (iii) > (ii) > (iv)
C.
(i) > (ii) > (iii) > (iv)
D.
(ii) > (iii) > (iv) > (i)
2008
NEET
MCQ
AIPMT 2008
How many stereoisomers does this molecule have?
CH3CH$=$CHCH2CHBrCH3
CH3CH$=$CHCH2CHBrCH3
A.
8
B.
2
C.
4
D.
6
2008
NEET
MCQ
AIPMT 2008
Which one of the following is most reactive towards electrophilic attack?
A.
B.
C.
D.
2007
NEET
MCQ
AIPMT 2007
For (i) I$-$, (ii) Cl$-$, (iii) Br$-$, the increasing order of nucleophilicity would be
A.
Cl$-$ < Br$-$ < I$-$
B.
I$-$ < Cl$-$ < Br$-$
C.
Br$-$ < Cl$-$ < I$-$
D.
I$-$ < Br$-$ < Cl$-$
2007
NEET
MCQ
AIPMT 2007
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
NEET
MCQ
AIPMT 2007
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
NEET
MCQ
AIPMT 2006
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
NEET
MCQ
AIPMT 2005
The chirality of the compound
A.
R
B.
S
C.
E
D.
Z
2005
NEET
MCQ
AIPMT 2005
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
NEET
MCQ
AIPMT 2005
Which amongst the following is the most stable carbocation?
A.
$\mathop C\limits^ + $H3
B.
CH3$\mathop C\limits^ + $H2
C.
D.
2005
NEET
MCQ
AIPMT 2005
Names of some compounds are given. Which one is not in IUPAC system?
A.
B.
C.
D.
2005
NEET
MCQ
AIPMT 2005
The best method for the separation of naphthalene and benzoic acid from their mixture is
A.
distillation
B.
sublimation
C.
chromatography
D.
crystallisation.
2004
NEET
MCQ
AIPMT 2004
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
NEET
MCQ
AIPMT 2003
Which of the following pairs of compounds are enantiomers?
A.
B.
C.
D.
