2023
JEE Mains
MCQ
JEE Main 2023 (Online) 25th January Morning Shift
The correct sequence of reagents for the preparation of Q and R is :
A.
$\mathrm{(i)C{r_2}{O_3},770K,20~atm;
(ii)Cr{O_2}C{l_2},{H_3}{O^ + };
(iii)NaOH;(iv){H_3}{O^ + }}$
B.
$\mathrm{(i)Cr{O_2}C{l_2},{H_3}{O^ + };(ii)C{r_2}{O_3},770K,20~atm;(iii)NaOH;(iv){H_3}{O^ + }}$
C.
$\mathrm{(i)KMn{O_4},O{H^ - };(ii)M{o_2}{O_3},\Delta ;(iii)NaOH;(iv){H_3}{O^ + }}$
D.
$\mathrm{(i)M{o_2}{O_3},\Delta ;(ii)Cr{O_2}C{l_2},{H_3}{O^ + };(iii)NaOH;(iv){H_3}{O^ + }}$
2023
JEE Mains
MCQ
JEE Main 2023 (Online) 24th January Evening Shift
Find out the major products from the following reactions.
A.
B.
C.
D.
2023
JEE Mains
MCQ
JEE Main 2023 (Online) 24th January Morning Shift
In the following given reaction, 'A' is
A.
B.
C.
D.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 26th July Morning Shift
$ \stackrel{\bullet}{\mathrm{Cl}}+\mathrm{CH}_{4} \rightarrow \mathrm{A}+\mathrm{B} $
A and B in the above atmospheric reaction step are :
A.
$\mathrm{C}_{2} \mathrm{H}_{6}$ and $\mathrm{Cl}_{2}$
B.
$\stackrel{\bullet}{\mathrm{C}} \mathrm{HCl}_{2}$ and $\mathrm{H}_{2}$
C.
$\stackrel{\bullet}{\mathrm{C}}\mathrm{H}_{3}$ and $\mathrm{HCl}$
D.
$\mathrm{C}_{2} \mathrm{H}_{6}$ and $\mathrm{HCl}$
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 25th July Evening Shift
Major product of the following reaction is
A.
B.
C.
D.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 25th July Morning Shift
A compound ‘$\mathrm{A}$’ on reaction with ‘$\mathrm{X}$’ and ‘$\mathrm{Y}$’ produces the same major product but different by product '$a$' and '$b^{\prime}$. Oxidation of '$a$' gives a substance produced by ants.
'X' and 'Y' respectively are
A.
$\mathrm{KMnO}_{4} / \mathrm{H}^{+}$ and dil. $\mathrm{KMnO}_{4^{\prime}} \,273 \mathrm{~K}$
B.
$\mathrm{KMnO}_{4}$ (dilute), $273 \mathrm{~K}$ and $\mathrm{KMnO}_{4} / \mathrm{H}^{+}$
C.
$\mathrm{KMnO}_{4} / \mathrm{H}^{+}$ and $\mathrm{O}_{3}, \mathrm{H}_{2} \mathrm{O} / \mathrm{Zn}$
D.
$\mathrm{O}_{3}, \mathrm{H}_{2} \mathrm{O} / \mathrm{Zn}$ and $\mathrm{KMnO}_{4} / \mathrm{H}^{+}$
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 29th June Morning Shift
Two isomers 'A' and 'B' with molecular formula C4H8 give different products on oxidation with KMnO4 in acidic medium. Isomer 'A' on reaction with KMnO4/H+ results in effervescence of a gas and gives ketone. The compound 'A' is
A.
But-1-ene.
B.
cis-But-2-ene.
C.
trans-But-2-ene.
D.
2-methyl propene.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 27th June Evening Shift
What will be the major product of following sequence of reactions?
A.
B.
C.
D.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 27th June Evening Shift
Product 'A' of following sequence of reactions is
A.
B.
C.
D.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 26th June Evening Shift
The major product in the following reaction
A.
B.
C.
D.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 25th June Morning Shift
The product formed in the following reaction.
A.
B.
C.
D.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 24th June Evening Shift
Given below are two statements :
Statement I : The presence of weaker $\pi$-bonds make alkenes less stable than alkanes.
Statement II : The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below :
A.
Both Statement I and Statement II are correct.
B.
Both Statement I and Statement II are incorrect.
C.
Statement I is correct but Statement II is incorrect.
D.
Statement I is incorrect but Statement II is correct.
2022
JEE Mains
MCQ
JEE Main 2022 (Online) 24th June Evening Shift
Which of the following reagents / reactions will convert 'A' to 'B' ?
A.
PCC oxidation
B.
Ozonolysis
C.
BH3, H2O2/$-$OH followed by PCC oxidation
D.
HBr, hydrolysis followed by oxidation by K2Cr2O7.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 1st September Evening Shift
The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are :
A.
2 enantiomers and 2 mesomers
B.
2 identical mesomers
C.
2 enantiomers
D.
1 racemic and 2 enantiomers
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 31st August Evening Shift
For the following sequence of reactions, the correct
products are :
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Evening Shift
The correct sequence of correct reagents for the following transformation is :
A.
(i) Fe, HCl
(ii) Cl2, HCl
(iii) NaNO2, HCl, 0$^\circ$C
(iv) H2O/H+
(ii) Cl2, HCl
(iii) NaNO2, HCl, 0$^\circ$C
(iv) H2O/H+
B.
(i) Fe, HCl
(ii) NaNO2, HCl, 0$^\circ$C
(iii) H2O/H+
(iv) Cl2, FeCl3
(ii) NaNO2, HCl, 0$^\circ$C
(iii) H2O/H+
(iv) Cl2, FeCl3
C.
(i) Cl2, FeCl3
(ii) Fe, HCl
(iii) NaNO2, HCl, 0$^\circ$C
(iv) H2O/H+
(ii) Fe, HCl
(iii) NaNO2, HCl, 0$^\circ$C
(iv) H2O/H+
D.
(i) Cl2, FeCl3
(ii) NaNO2, HCl, 0$^\circ$C
(iii) Fe, HCl
(iv) H2O/H+
(ii) NaNO2, HCl, 0$^\circ$C
(iii) Fe, HCl
(iv) H2O/H+
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 27th July Morning Shift
Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction :
CH4 + I2 $\mathrel{\mathop{\kern0pt\rightleftharpoons} \limits_{{\mathop{\rm Re}\nolimits} versible}^{hv}} $ CH3 $-$ I + HI
CH4 + I2 $\mathrel{\mathop{\kern0pt\rightleftharpoons} \limits_{{\mathop{\rm Re}\nolimits} versible}^{hv}} $ CH3 $-$ I + HI
A.
HOCl
B.
dilute HNO2
C.
Liquid NH3
D.
Concentrated HIO3
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th July Morning Shift
An organic compound 'A' C4H8 on treatment with KMnO4/H+ yields compound 'B' C3H6O.
Compound 'A' also yields compound 'B' an ozonolysis. Compound 'A' is :
Compound 'A' also yields compound 'B' an ozonolysis. Compound 'A' is :
A.
2-Methylpropene
B.
1-Methylcyclopropane
C.
But-2-ene
D.
Cyclobutane
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Evening Shift
Metallic sodium does not react normally with :
A.
gaseous ammonia
B.
But-2-yne
C.
Ethyne
D.
tert-butyl alcohol
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Evening Shift
Benzene on nitration gives nitrobenzene in presence of HNO3 and H2SO4 mixture, where :
A.
both H2SO4 and HNO3 act as a bases
B.
HNO3 acts as an acid and H2SO4 acts as a base
C.
both H2SO4 and HNO3 act as an acids
D.
HNO3 acts as a base and H2SO4 acts as an acid
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Evening Shift
Major product P of above reaction, is :
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 20th July Morning Shift
For above chemical reactions, identify the correct statement from the following :
A.
Both compound 'A' and compound 'B' are dicarboxylic acids
B.
Both compound 'A' and compound 'B' are diols
C.
Compound 'A' is diol and compound 'B' is dicarboxylic acid
D.
Compound 'A' is dicarboxylic acid and compound 'B' is diol
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 18th March Morning Shift
Match List - I with List - II :
List - I (Chemicals)
(a) Alcoholic potassium hydroxide
(b) Pd/BaSO4
(c) BHC (Benzene hexachloride)
(d) Polyacetylene
List - II (Use / Preparation / Constituent)
(i) Electrodes in batteries
(ii) Obtained by addition reaction
(iii) Used for $\beta$ - elimination reaction
(iv) Lindlar's catalyst
Choose the most appropriate match :
List - I (Chemicals)
(a) Alcoholic potassium hydroxide
(b) Pd/BaSO4
(c) BHC (Benzene hexachloride)
(d) Polyacetylene
List - II (Use / Preparation / Constituent)
(i) Electrodes in batteries
(ii) Obtained by addition reaction
(iii) Used for $\beta$ - elimination reaction
(iv) Lindlar's catalyst
Choose the most appropriate match :
A.
(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)
B.
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
C.
(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)
D.
(a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
Choose the correct statement regarding the formation of carbocations A and B given.
A.
Carbocation A is more stable and formed relatively at faster rate
B.
Carbocation B is more stable and formed relatively at slow rate
C.
Carbocation B is more stable and formed relatively at faster rate
D.
Carbocation A is more stable and formed relatively at slow rate
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 17th March Evening Shift
Given below are two statements :
Statement I : 2-methylbutane on oxidation with KMnO4 gives 2-methylbutan-2-ol.
Statement II : n-alkanes can be easily oxidised to corresponding alcohols with KMnO4.
Choose the correct option :
Statement I : 2-methylbutane on oxidation with KMnO4 gives 2-methylbutan-2-ol.
Statement II : n-alkanes can be easily oxidised to corresponding alcohols with KMnO4.
Choose the correct option :
A.
Both statement I and statement II are incorrect
B.
Both statement I and statement II are correct
C.
Statement I is correct but statement II is incorrect
D.
Statement I is incorrect but statement II is correct
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Evening Shift
An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with ammonical silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon X is :
A.
HC $ \equiv $ C $-$ CH2 $-$ CH3
B.
C.
CH3 $-$ C $ \equiv $ C $-$ CH3
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 16th March Morning Shift
Which of the following is Lindlar catalyst?
A.
Partially deactivated palladised charcoal
B.
Zinc chloride and HCl
C.
Sodium and Liquid NH3
D.
Cold dilute solution of KMnO4
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 26th February Evening Shift
In $\mathop C\limits^1 {H_2} = \mathop C\limits^2 = \mathop C\limits^3 H - \mathop C\limits^4 {H_3}$ molecule, the hybridization of carbon 1, 2, 3 and 4 respectively, are :
A.
sp2, sp, sp2, sp3
B.
sp2, sp2, sp2, sp3
C.
sp3, sp, sp3, sp3
D.
sp2, sp3, sp2, sp3
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Evening Shift
The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is :
A.
$C{H_3}COCl/AlC{l_3},B{r_2}/AlB{r_3},HN{O_3}/{H_2}S{O_4},Zn/HCl$
B.
$C{H_3}COCl/AlC{l_3},Zn - Hg/HCl,B{r_2}/AlB{r_3},HN{O_3}/{H_2}S{O_4}$
C.
$B{r_2}/AlB{r_3},C{H_3}COCl/AlC{l_3},HN{O_3}/{H_2}S{O_4},Zn/HCl$
D.
$HN{O_3}/{H_2}S{O_4},B{r_2}/AlC{l_3},C{H_3}COCl/AlC{l_3},Zn - Hg/HCl$
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Evening Shift
The major product of the following reaction is :
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 25th February Morning Shift
Identify A in the given chemical reaction.
A.
B.
C.
D.
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Evening Shift
The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :
A.
(iv) < (i) < (ii) < (iii)
B.
(iv) < (iii) < (ii) < (i)
C.
(iv) < (i) < (iii) < (ii)
D.
(i) < (ii) < (iii) < (iv)
2021
JEE Mains
MCQ
JEE Main 2021 (Online) 24th February Morning Shift
Identify products A and B.
A.
B.
C.
D.
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
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)
