2021
JEE Mains
Numerical
JEE Main 2021 (Online) 25th July Morning Shift
The number of sigma bonds in
is _______________.
is _______________.
Correct Answer: 10
Explanation:
Numbers of $\sigma$ bonds = 10
2021
JEE Mains
Numerical
JEE Main 2021 (Online) 25th February Morning Shift
Consider the following chemical reaction.
The number of sp2 hybridized carbon atom(s) present in the product is ________.
The number of sp2 hybridized carbon atom(s) present in the product is ________.
Correct Answer: 7
Explanation:
All the 7-carbon-atoms in product are sp2 hybridised.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 6th September Morning Slot
The major product obtained from the following
reaction is :
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 6th September Morning Slot
The major product of the following reaction is :
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 3rd September Morning Slot
Which of the following compounds produces an optically inactive compound on hydrogenation?
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 2nd September Morning Slot
The major product in the following reaction is :
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 9th January Morning Slot
The major product (Y) in the following
reactions is :
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 9th January Morning Slot
The correct order of heat of combustion for
following alkadienes is :
A.
(b) < (c) < (a)
B.
(a) < (c) < (b)
C.
(a) < (b) < (c)
D.
(c) < (b) < (a)
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 8th January Evening Slot
The major product [B] in the following
sequence of reactions is :-
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 8th January Evening Slot
The major product in the following reaction is:
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 7th January Evening Slot
In the following reactions sequence, structure of A and B respectively will be :
A.
B.
C.
D.
2020
JEE Mains
MCQ
JEE Main 2020 (Online) 7th January Morning Slot
Consider the following reaction :
${\left( {C{H_3}} \right)_3}CCH\left( {OH} \right)C{H_3}\buildrel {conc.\,\,\,{H_2}S{O_4}} \over \longrightarrow $
${\left( {C{H_3}} \right)_2}CHCH\left( {Br} \right)C{H_3}\buildrel {alc.\,\,KOH} \over \longrightarrow $
${\left( {C{H_3}} \right)_2}{\rm{ }}CHCH\left( {Br} \right)C{H_3}\buildrel {{{(C{H_3})}_3}{O^\Theta }{K^ \oplus }} \over \longrightarrow $
${\left( {C{H_3}} \right)_2}\mathop C\limits_{\mathop |\limits_{OH} } - C{H_2} - CHO\buildrel \Delta \over \longrightarrow $
Which of these reaction(s) will not produce Saytzeff product ?
${\left( {C{H_3}} \right)_3}CCH\left( {OH} \right)C{H_3}\buildrel {conc.\,\,\,{H_2}S{O_4}} \over \longrightarrow $
${\left( {C{H_3}} \right)_2}CHCH\left( {Br} \right)C{H_3}\buildrel {alc.\,\,KOH} \over \longrightarrow $
${\left( {C{H_3}} \right)_2}{\rm{ }}CHCH\left( {Br} \right)C{H_3}\buildrel {{{(C{H_3})}_3}{O^\Theta }{K^ \oplus }} \over \longrightarrow $
${\left( {C{H_3}} \right)_2}\mathop C\limits_{\mathop |\limits_{OH} } - C{H_2} - CHO\buildrel \Delta \over \longrightarrow $
Which of these reaction(s) will not produce Saytzeff product ?
A.
(d) only
B.
(b) and (d)
C.
(a), (c) and (d)
D.
(c) only
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 5th September Morning Slot
The minimum number of moles of O2
required for complete combustion of 1 mole of propane and 2
moles of butane is _____.
Correct Answer: 18
Explanation:
C3H8(g) + 5O2(g) $ \to $ 3CO2(g) + 4H2O(l)
C4H10(g) + ${{13} \over 2}$O2(g) $ \to $ 4CO2(g) + 5H2O(l)
$ \therefore $ No. of moles of O2 required to oxidise 1 mole of propane = 5
$ \therefore $ No. of moles of O2 required to oxidise 1 mole of butane = ${{13} \over 2}$
So, No. of moles of O2 required to oxidise 1 mole of
propane and 2 moles of butane = 5 + 2 $ \times $ ${{13} \over 2}$ = 18
C4H10(g) + ${{13} \over 2}$O2(g) $ \to $ 4CO2(g) + 5H2O(l)
$ \therefore $ No. of moles of O2 required to oxidise 1 mole of propane = 5
$ \therefore $ No. of moles of O2 required to oxidise 1 mole of butane = ${{13} \over 2}$
So, No. of moles of O2 required to oxidise 1 mole of
propane and 2 moles of butane = 5 + 2 $ \times $ ${{13} \over 2}$ = 18
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 3rd September Morning Slot
The total number of monohalogenated organic
products in the following (including
stereoisomers) reaction is ______.
Correct Answer: 8
Explanation:
2020
JEE Mains
Numerical
JEE Main 2020 (Online) 8th January Evening Slot
In the following sequence of reactions the
maximum number of atoms present in
molecule 'C' in one plane is _________.
(A is a lowest molecular weight alkyne)
(A is a lowest molecular weight alkyne)
Correct Answer: 13
Explanation:
As A is a lowest molecular weight alkyne. So A is H - C $ \equiv $ C - H.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Evening Slot
Consider the following reactions :
'A' is :
'A' is :
A.
$CH \equiv CH$
B.
$C{H_3} - C \equiv C - C{H_3}$
C.
$C{H_3} - C \equiv CH$
D.
$C{H_2} = C{H_2}$
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Evening Slot
In the following skew conformation of ethane, H'–C–C–H'' dihedral angle is :
A.
120o
B.
58o
C.
151o
D.
149o
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Morning Slot
The major product of the following addition reaction is :
H3C–CH=CH2 $\buildrel {C{l_2}/{H_2}O} \over \longrightarrow $
H3C–CH=CH2 $\buildrel {C{l_2}/{H_2}O} \over \longrightarrow $
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th April Morning Slot
But-2-ene on reaction with alkaline KMnO4 at elevated temperature followed by acidification will give :
A.
one molecule of CH3CHO and one molecule of CH3COOH
B.
2 molecules of CH3COOH
C.
D.
2 molecules of CH3CHO
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th April Evening Slot
Increasing order of reactivity of the following
compounds for SN1 substitution is:
A.
(A) < (B) < (D) < (C)
B.
(B) < (C) < (D) < (A)
C.
(B) < (A) < (D) < (C)
D.
(B) < (C) < (A) < (D)
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th April Evening Slot
Which of the following potential energy (PE)
diagrams represents the SN1 reaction?
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th April Morning Slot
The major product of the following reaction is :
A.
CH3CD2CH(Cl)(I)
B.
CH3CD(Cl)CHD(I)
C.
CH3C(I)(Cl)CHD2
D.
CH3CD(I)CHD(Cl)
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 9th April Morning Slot
The major product of the following reaction is :
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 8th April Evening Slot
Polysubstitution is a major drawback in:
A.
Reimer Tiemann reaction
B.
Friedel Craft's alkylation
C.
Acetylation of aniline
D.
Friedel Craft's acylation
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The major product of the following reaction is :
A.
CH3CH2C$ \equiv $CH
B.
CH3CH=C=CH2
C.
D.
CH3CH=CHCH2NH2
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The major product of the following reaction is –
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Evening Slot
The major product of the following reaction is –
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Morning Slot
The correct order for acid strength of compounds :
CH $ \equiv $ CH, CH3–C $ \equiv $ CH and CH2 = CH2 is as follows
CH $ \equiv $ CH, CH3–C $ \equiv $ CH and CH2 = CH2 is as follows
A.
CH $ \equiv $ CH > CH2 = CH2 > CH3 – C $ \equiv $ CH
B.
CH3 – C $ \equiv $ CH > CH2 = CH2 > HC $ \equiv $ CH
C.
HC $ \equiv $ CH > CH3 – C $ \equiv $ CH > CH2 = CH2
D.
CH3 – CH $ \equiv $ CH > CH $ \equiv $ CH > CH2 = CH2
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 12th January Morning Slot
The major product of the following reaction is
A.
B.
C.
photo due
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 11th January Morning Slot
Which compound (s) out of the following is/are not aromatic ?
A.
(A) and (C)
B.
(C) and (D)
C.
(B)
D.
(B), (C) and (D)
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 10th January Morning Slot
The major product of the following reaction is
A.
B.
C.
D.
2019
JEE Mains
MCQ
JEE Main 2019 (Online) 10th January Morning Slot
The major product of the following reaction is :
A.
B.
C.
D.
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 16th April Morning Slot
The major product of the following reaction is :
A.
B.
C.
D.
2018
JEE Mains
MCQ
JEE Main 2018 (Offline)
The trans-alkenes are formed by the reduction of alkynes with
A.
Sn - HCl
B.
H2 – Pd/C, BaSO4
C.
NaBH4
D.
Na/liq. NH3
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Evening Slot
The major product formed in the following reaction is :
A.
B.
C.
D.
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Evening Slot
When 2-butyne is treate with H2/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq. NH3 it produces Y as the major product Which of the following statements is correct ?
A.
X will have higher dipole moment and higher boiling point than Y.
B.
Y will have higher dipole moment and higher boiling point than X.
C.
X will have lower dipole moment and lower boiling point than Y.
D.
Y will have higher dipole momet and lower boiling point than X.
2018
JEE Mains
MCQ
JEE Main 2018 (Online) 15th April Morning Slot
Which of the following will most readily give the dehydrohalogenation product ?
A.
B.
C.
D.
2017
JEE Mains
MCQ
JEE Main 2017 (Online) 9th April Morning Slot
The major product of the following reaction is :
A.
B.
C.
D.
2016
JEE Mains
MCQ
JEE Main 2016 (Online) 10th April Morning Slot
Consider the reaction sequence below :
X is:
X is:
A.
B.
C.
D.
2016
JEE Mains
MCQ
JEE Main 2016 (Online) 9th April Morning Slot
5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is :
A.
Ethane
B.
Propane
C.
Butane
D.
Isobutane
2016
JEE Mains
MCQ
JEE Main 2016 (Offline)
The reaction of propene with HOCl (Cl2 + H2O) proceeds through the intermediate:
A.
$\mathrm{CH}_{3}-\mathrm{CH}^{+}-\mathrm{CH}_{2}-\mathrm{OH}$
B.
$\mathrm{CH}_{3}-\mathrm{CHCl}-\mathrm{CH}_{2}^{+}$
C.
CH3 - CH+ - CH2 - OH
D.
$\mathrm{CH}_{3}-\mathrm{CH}^{+}-\mathrm{CH}_{2}-\mathrm{Cl}$
2016
JEE Mains
MCQ
JEE Main 2016 (Offline)
At 300 K and 1 atm, 15 mL of a gaseous hydrocarbon requires 375 mL air containing 20% O2 by volume
for complete combustion. After combustion the gases occupy 345 mL. Assuming that the water formed is
in liquid form and the volumes were measured at the same temperature and pressure, the formula of the hydrocarbon is:
A.
C3H8
B.
C4H8
C.
C4H10
D.
C3H6
2012
JEE Mains
MCQ
AIEEE 2012
Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of
mono substituted alkyl halide ?
A.
Tertiary butyl chloride
B.
Neopentane
C.
Isohexane
D.
Neohexane
2012
JEE Mains
MCQ
AIEEE 2012
2–Hexyne gives trans–2–Hexene on treatment with :
A.
Pt/H2
B.
Li/NH3
C.
Pd/BaSO4
D.
LiAlH4
2011
JEE Mains
MCQ
AIEEE 2011
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the
presence of :
A.
a vinyl group
B.
an isopropyl group
C.
an acetylenic triple bond
D.
two ethylenic double bonds
2010
JEE Mains
MCQ
AIEEE 2010
The main product of the following reaction is
$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,$ ${C_6}{H_5}C{H_2}CH\left( {OH} \right)CH{\left( {C{H_3}} \right)_2}\buildrel {conc.{H_2}S{O_4}} \over \longrightarrow \,?$
$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,$ ${C_6}{H_5}C{H_2}CH\left( {OH} \right)CH{\left( {C{H_3}} \right)_2}\buildrel {conc.{H_2}S{O_4}} \over \longrightarrow \,?$
A.
B.
C.
D.
2008
JEE Mains
MCQ
AIEEE 2008
Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so
obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed
contains
A.
mixture of o− and p−bromotoluenes
B.
mixture of o− and p−dibromobenzenes
C.
mixture of o− and p−bromoanilines
D.
mixture of o− and m−bromotoluenes
2008
JEE Mains
MCQ
AIEEE 2008
The treatment of $C{H_3}MgX\,\,$ with $C{H_3}C \equiv C - H$ produces
A.
$C{H_3} - CH = C{H_2}$
B.
$C{H_3}C \equiv C - C{H_3}$
C.
D.
$C{H_4}$
2008
JEE Mains
MCQ
AIEEE 2008
The hydrocarbon which can react with sodium in liquid ammonia is
A.
CH3CH2CH2C≡CCH2CH2CH3
B.
CH3CH2C≡CH
C.
CH3CH=CHCH3
D.
CH3CH2C≡CCH2CH3
2008
JEE Mains
MCQ
AIEEE 2008
In the following sequence of reactions, the alkene affords the compound ‘B’
CH3 - CH = CH - CH3 $\buildrel {{O_3}} \over \longrightarrow $ A $\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Zn}^{H{}_2O}} $ B
The compound B is
CH3 - CH = CH - CH3 $\buildrel {{O_3}} \over \longrightarrow $ A $\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Zn}^{H{}_2O}} $ B
The compound B is
A.
CH3CH2CHO
B.
CH3COCH3
C.
CH3CH2COCH3
D.
CH3CHO
