Basics of Organic Chemistry
284 Questions
2009
JEE Mains
MCQ
AIEEE 2009
The IUPAC name of neopentane is
A.
2-methylbutane
B.
2, 2-dimethylpropane
C.
2-methylpropane
D.
2,2-dimethylbutane
2009
JEE Mains
MCQ
AIEEE 2009
Arrange the carbanions, ${(C{H_3})_3}\overline C $, $\overline C C{l_3}$ , ${(C{H_3})_2}\overline C H$, ${C_6}{H_5}\overline C H{}_2$ in order of their decreasing stability :
A.
${(C{H_3})_2}\overline C H$ > $\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_3}\overline C $
B.
$\overline C C{l_3}$ > ${C_6}{H_5}\overline C H{}_2$ > ${(C{H_3})_2}\overline C H$ > ${(C{H_3})_3}\overline C $
C.
${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$ > ${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$
D.
${C_6}{H_5}\overline C H{}_2$ > $\overline C C{l_3}$ > ${(C{H_3})_3}\overline C $ > ${(C{H_3})_2}\overline C H$
2008
JEE Mains
MCQ
AIEEE 2008
The absolute configuration of
A.
$S,S$
B.
$R,R$
C.
$R,S$
D.
$S,R$
2008
JEE Mains
MCQ
AIEEE 2008
The electrophile, ${E^ \oplus }$ attacks the benzene ring to generate the intermediate $\sigma - $complex. Of the following, which $\sigma - $complex is lowest energy?
A.
B.
C.
D.
2008
JEE Mains
MCQ
AIEEE 2008
The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC
system of nomenclature is
A.
−COOH, −SO3H, −CONH2, −CHO
B.
−SO3H, −COOH, −CONH2, −CHO
C.
−CHO, −COOH, −SO3H, −CONH2
D.
−CONH2, −CHO, −SO3H, −COOH
2007
JEE Mains
MCQ
AIEEE 2007
Presence of a nitro group in a benzene ring
A.
activates the ring towards electrophilic substitution
B.
renders the ring basic
C.
deactivates the ring towards nucleophilic substitution
D.
deactivates the ring towards electrophilic substitution
2007
JEE Mains
MCQ
AIEEE 2007
Which of the following molecules is expected to rotate the plane of plane - polarized light?
A.
B.
C.
D.
2007
JEE Mains
MCQ
AIEEE 2007
A.
$3$ - enthyl - $4$ - $4$ - dimethylheptane
B.
$1,1$ - diethyl - $2,2$ - dimethylpentane
C.
$4, 4$ - dimethyl -$5,5$ - diethylpentane
D.
$5,5$ - diethyl - $4,4$ - dimethylpentane.
2007
JEE Mains
MCQ
AIEEE 2007
Which one of the following conformation of cyclohexane is chiral?
A.
Twist boat
B.
Rigid
C.
Chair
D.
Boat
2006
JEE Mains
MCQ
AIEEE 2006
CH3Br + Nu- $\to$ CH3 - Nu + Br- The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D is
[Nu– = (A) PhO–, (B) AcO–, (C) HO–, (D) CH3O–]
[Nu– = (A) PhO–, (B) AcO–, (C) HO–, (D) CH3O–]
A.
A > B > C > D
B.
B > D > C > A
C.
D > C > A > B
D.
D > C > B > A
2006
JEE Mains
MCQ
AIEEE 2006
Increasing order of stability among the three main conformations (i.e. Eclipse, Anti, Gauche) of
2-fluoroethanol is
A.
Eclipse, Gauche, Anti
B.
Gauche, Eclipse, Anti
C.
Eclipse, Anti, Gauche
D.
Anti, Gauche, Eclipse
2006
JEE Mains
MCQ
AIEEE 2006
The increasing order of stability of the following free radicals is
A.
${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$
B.
${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$
C.
${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$
D.
${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet $ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$
2006
JEE Mains
MCQ
AIEEE 2006
The $IUPAC$ name of the compound shown below is :
A.
$3$-bromo - $1$-chlorocyclohexene
B.
$1$-bromo - $3$-chlorocyclohexene
C.
$2$-bromo - $6$-chlorocyclohex - $1$ -ene
D.
$6$-bromo - $2$ - chlorocyclohexene
2005
JEE Mains
MCQ
AIEEE 2005
The reaction
is fastest when $X$ is
is fastest when $X$ is
A.
$OCOR$
B.
$O{C_2}{H_5}$
C.
$N{H_2}$
D.
$Cl$
2005
JEE Mains
MCQ
AIEEE 2005
The decreasing order of nucleophilicity among the nucleophiles
A.
$\left( C \right),\left( B \right),\left( A \right),\left( D \right)$
B.
$\left( B \right),\left( C \right),\left( A \right),\left( D \right)$
C.
$\left( D \right),\left( C \right),\left( B \right),\left( A \right)$
D.
$\left( A \right),\left( B \right),\left( C \right),\left( D \right)$
2005
JEE Mains
MCQ
AIEEE 2005
Due to the presence of an unpaired electron, free radicals are:
A.
Chemically reactive
B.
Chemically inactive
C.
Anions
D.
Cations
2004
JEE Mains
MCQ
AIEEE 2004
Consider the acidity of the carboxylic acids:
(a) PhCOOH
(b) o – NO2C6H4COOH
(c) p – NO2C6H4COOH
(d) m – NO2C6H4COOH
Which of the following order is correct?
(a) PhCOOH
(b) o – NO2C6H4COOH
(c) p – NO2C6H4COOH
(d) m – NO2C6H4COOH
Which of the following order is correct?
A.
(b) > (d) > (a) > (c)
B.
(b) > (d) > (c) > (a)
C.
(a) > (b) > (c) > (d)
D.
(b) > (c) > (d) > (a)
2004
JEE Mains
MCQ
AIEEE 2004
Which of the following will have meso-isomer also?
A.
2- chlorobutane
B.
2- hydroxyopanoic acid
C.
2,3 – dichloropentane
D.
2-3- dichlorobutane
2004
JEE Mains
MCQ
AIEEE 2004
The $IUPAC$ name of the compound is
A.
$3,3$-dimethyl - $1$ - cyclohexanol
B.
$1,1$-dimethyl- $3$ -hydroxy cyclohexane
C.
$3,3$-dimethyl- $1$ -hydroxy cyclohexane
D.
$1,1$-dimethyl - $3$ - cyclohexanol
2004
JEE Mains
MCQ
AIEEE 2004
Which of the following is the strongest base ?
A.
B.
C.
D.
2004
JEE Mains
MCQ
AIEEE 2004
Amongst the following compounds, the optically active alkane having lowest molecular mass is
A.
B.
C.
D.
2004
JEE Mains
MCQ
AIEEE 2004
Rate of the reaction
is fastest when $Z$ is
is fastest when $Z$ is
A.
$O{C_2}{H_5}$
B.
$N{H_2}$
C.
$Cl$
D.
$OCOC{H_3}$
2004
JEE Mains
MCQ
AIEEE 2004
Which one the following does not have sp2 hybridized carbon?
A.
Acetone
B.
Acetamide
C.
Acetonitrile
D.
Acetic acid
2004
JEE Mains
MCQ
AIEEE 2004
Which of the following compound is not chiral?
A.
1- chloropentane
B.
3-chloro-2- methyl pentane
C.
1-chloro -2- methyl pentane
D.
2- chloropentane
2003
JEE Mains
MCQ
AIEEE 2003
Among the following four structures $i$ to $iv,$
it is true that
it is true that
A.
only $i$ and $ii$ are chiral compounds
B.
only $iii$ is a chiral compound
C.
only $ii$ and $iv$ are chiral compounds
D.
all four are chiral compounds
2003
JEE Mains
MCQ
AIEEE 2003
The IUPAC name of CH3COCH(CH3)2 is
A.
2-methyl-3-butaone
B.
4-methylisopropyl 1 ketone
C.
3-methyl-2-butaone
D.
Isopropylmethyl ketone
2003
JEE Mains
MCQ
AIEEE 2003
The general formula CnH2nO2 could be for open chain
A.
carboxylic acids
B.
diols
C.
dialdehydes
D.
deketones
2003
JEE Mains
MCQ
AIEEE 2003
In the anion HCOO$-$
the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
A.
The C = O bond is weaker than the C-O bond
B.
The anion HCOO-
has two resonating structures
C.
The anion is obtained by removal of a proton from the acid molecule
D.
Electronic orbitals of carbon atom are hybridised
2002
JEE Mains
MCQ
AIEEE 2002
Racemic mixture is formed by mixing two
A.
isomeric compounds
B.
enantiomers with chiral compounds
C.
meso compounds
D.
optical isomers
2002
JEE Mains
MCQ
AIEEE 2002
Which of the following does not show geometrical isomerism?
A.
1,2-dichloro-1-pentene
B.
1,3-dichloro-2-pentene
C.
1,1-dichloro-1-pentene
D.
1,4-dichloro-2-pentene
2002
JEE Mains
MCQ
AIEEE 2002
Arrangement of (CH3)3C-, (CH3)2CH-, CH3-CH2- when attached to benzyl or an unsaturated group in increasing order of inductive effect is
A.
(CH3)3C- < (CH3)2CH- < CH3-CH2
B.
CH3-CH2- < (CH3)2CH- < (CH3)3C-
C.
(CH3)2CH- < (CH3)3C- < CH3-CH2
D.
(CH3)3C- < CH3-CH2- < CH3)2CH-
2002
JEE Mains
MCQ
AIEEE 2002
Which of the following compounds has wrong $IUPAC$ name ?
A.
B.
C.
D.
2002
JEE Mains
MCQ
AIEEE 2002
A similarity between optical and geometrical isomerism is that
A.
each forms equal number of isomers for a given compound
B.
if in a compound one is present then so is the other
C.
both are included in stereoisomerism
D.
they have no similarity
2002
JEE Mains
MCQ
AIEEE 2002
Following types of compounds (as $I, II$ )
are studied in terms of isomerism in :
are studied in terms of isomerism in :
A.
chain isomerism
B.
position isomerism
C.
conformers
D.
stereoisomerism
