Basics of Organic Chemistry
334 Questions
2007
JEE Advanced
MCQ
IIT-JEE 2007 Paper 1 Offline
The number of structural isomers for C$_6$H$_{14}$ is :
A.
3
B.
4
C.
5
D.
6
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
2006
JEE Advanced
MCQ
IIT-JEE 2006
What are N and M?
A.
6,6
B.
6,4
C.
4,4
D.
3,3
The chlorination yields total 6 different compounds. The compounds I, II, III and IV have chiral centres present in it. The compounds I and II, III and IV are a pair of enantiomers due to presence of chiral centres. Hence, value of N will be 6 .
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
1994
JEE Advanced
Numerical
IIT-JEE 1994
The IUPAC name of succinic acid is _______.
Correct Answer: butane-1, 4-dioic acid
1991
JEE Advanced
MCQ
IIT-JEE 1991
The hybridization of carbon atoms in C-C single bond of HC $ \equiv $ C - CH = CH2 is
A.
$sp^3 - sp^3$
B.
$sp^2 - sp^3$
C.
$sp - sp^2$
D.
$sp^3 - sp$
1991
JEE Advanced
Numerical
IIT-JEE 1991
Write the IUPAC name for the following :
Correct Answer: 3-(N,N-dimethyl amino)-3-methylpentane
<br/>or
<br/>N,N,3 - trimethylpentan -3- amine
1990
JEE Advanced
Numerical
IIT-JEE 1990
Give the IUPAC name of the following compound :
Correct Answer: 5, 6 - diethyl-3-methyldec-4-ene
1987
JEE Advanced
MCQ
IIT-JEE 1987
The IUPAC name of the compound
CH2 = CH $-$ CH(CH3)2
CH2 = CH $-$ CH(CH3)2
A.
1, 1-dimethyl-2-propene
B.
3-methylbut-1-ene
C.
2-vinylpropane
D.
1 isopropylethylene
1986
JEE Advanced
Numerical
IIT-JEE 1986
Write the IUPAC name of :
CH3CH2CH = CHCOOH
CH3CH2CH = CHCOOH
Correct Answer: Pent-2-en-1-oic acid or 2-Pentenoic acid
Explanation:
Note :
(1) Here functional group $-$COOH present. All functional groups add as secondary suffix.
(a) If carbon atom of $-$COOH group present in main chain then secondary suffix name is $\to$ oic acid.
(b) If carbon atom of $-$COOH group present not in main chain then secondary suffix name is $\to$ carboxylic acid.
As here carbon atom of $-$COOH group present in main chain that is why we use oic acid.
(2) Functional group should always get lowest possible number.
(3) Alkane, alkene(=) and alkyne($\equiv$) always act as primary suffix.
For alkane we use word "ane".
For alkene we use word "ene".
For alkyne we use word "yne".
Here alkene(=) present so we use word "ene" as primary suffix.
(4) After last e of "ene" if we get a, i, o, u, y as the first letter of secondary suffix then we delete e.
Here in the name $\to$
(5) Naming is done by following way $\to$
Prefix + word root + suffix(p) + suffix(s)
(a) Here no prefix (name of side chain) as there is no side chain present.
(b) Word root represent number of carbon atom in main chain.
Here in main chain 5 carbon atoms present so word root is "pent".
(c) Primary suffix is alkene.
(d) Secondary suffix is function group $-$COOH. It's name oic acid.
(6) If functional group's carbon get number "1" then we can ignore it in nomenclature. So it's nomenclature can be also $\to$
$\mathrm{pent - 2 - enoic\,acid}$
1984
JEE Advanced
MCQ
IIT-JEE 1984
The IUPAC name of the compound having the formula is :
A.
3, 3, 3-trimethyl-1-propene
B.
1, 1, 1-trimethyl-2-propene
C.
3, 3-dimethylbut-1-ene
D.
2, 2-dimethyl-3-butene
