Basics of Organic Chemistry PYQs - Last 10 Years
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ChemistryOrganic Chemistry2017-2026
Practice 250 JEE Main Chemistry questions from Basics of Organic Chemistry. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 10 Years Basics of Organic Chemistry Questions
Showing 50 of 250 filtered questions.
1Basics Of Organic Chemistry
\(\text { The total number of aromatic compounds/species from the following is }\)
MCQ+4 / -12026
2Basics Of Organic Chemistry
Given below are two statements :
Statement I : Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement II : The vapours rising up in the fractiona...
Statement I : Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement II : The vapours rising up in the fractiona...
MCQ+4 / -12026
3Basics Of Organic Chemistry
Shown below is the structure of methyl acetate with three different $\alpha, \beta$ and $\gamma$ carbon - oxygen bonds.
The correct order of bond lengths of these bonds is :
The correct order of bond lengths of these bonds is :
MCQ+4 / -12026
4Basics Of Organic Chemistry
Given below are two statements :
Statement I : On the basis of inductive effect, the order of stability of alkyl carbanions is $\mathrm{CH}_3{ }^{-}>\mathrm{CH}_3-\mathrm{CH}_2{ }^{-}>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}>\left(\math...
Statement I : On the basis of inductive effect, the order of stability of alkyl carbanions is $\mathrm{CH}_3{ }^{-}>\mathrm{CH}_3-\mathrm{CH}_2{ }^{-}>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}>\left(\math...
MCQ+4 / -12026
5Basics Of Organic Chemistry
Increasing order of electron withdrawing power of following functional groups is :
a. -CN
b. -COOH
c. $-\mathrm{NO}_2$
d. -I
a. -CN
b. -COOH
c. $-\mathrm{NO}_2$
d. -I
MCQ+4 / -12026
6Basics Of Organic Chemistry
\(\text { The descending order of acidity among the following compounds is : }\)
Choose the correct answer from the options given below :
Choose the correct answer from the options given below :
MCQ+4 / -12026
7Basics Of Organic Chemistry
\(\text { Consider the following molecules/species : }\)
\(\text { The correct order of carbon-oxygen double bond length is : }\)
\(\text { The correct order of carbon-oxygen double bond length is : }\)
MCQ+4 / -12026
8Basics Of Organic Chemistry
\(\text { Match the LIST-I with LIST-II }\)
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MCQ+4 / -12026
9Basics Of Organic Chemistry
\(\text { The following structures are }\)
MCQ+4 / -12026
10Basics Of Organic Chemistry
\(\text { The strongest conjugate acid will result from : }\)
MCQ+4 / -12026
11Basics Of Organic Chemistry
For the given molecule, "x", the preferred site for the attack of the electrophile is :
MCQ+4 / -12026
12Basics Of Organic Chemistry
In IUPAC nomenclature, the correct order of decreasing priority of functional group is :
MCQ+4 / -12026
13Basics Of Organic Chemistry
Given below are two statements : Statement I : In , the carbocation is stabilised by +R effect of –OCH3 group. Statement II : In , the carbanion is stabilised by –R effect of –NO2 group. In the light of the above statements, choose the corr...
MCQ+4 / -12026
14Basics Of Organic Chemistry
CORRECT order of stability for the following is
$\mathrm{CH}_2=\mathrm{CH}^{-}, \mathrm{CH}_3-\mathrm{CH}_2^{-}, \mathrm{CH} \equiv \mathrm{C}^{-}$
$\mathrm{CH}_2=\mathrm{CH}^{-}, \mathrm{CH}_3-\mathrm{CH}_2^{-}, \mathrm{CH} \equiv \mathrm{C}^{-}$
MCQ+4 / -12026
15Basics Of Organic Chemistry
0.53 g of an organic compound $(\mathrm{x})$ when heated with excess of nitric acid (concentrated) and then with silver nitrate gave 0.75 g of silver bromide precipitate. 1.0 g of $(\mathrm{x})$ gave 1.32 g of $\mathrm{CO}_2$ gas on combust...
INTEGER+4 / -12026
16Basics Of Organic Chemistry
The cyclic cations having the same number of hyperconjugation are :Choose the correct answer from the options given below :
MCQ+4 / -12026
17Basics Of Organic Chemistry
Identify the correct statements :The presence of –NO2 group in benzene ringA. activates the ring towards electrophilic substitutions.B. deactivates the ring towards electrophilic substitutions.C. activates the ring towards nucleophilic subs...
MCQ+4 / -12026
18Basics Of Organic Chemistry
\(\text { Arrange the following carbanions in the decreasing order of stability. }\)
Choose the correct answer from the options given below :
Choose the correct answer from the options given below :
MCQ+4 / -12026
19Basics Of Organic Chemistry
Find out the statements which are not true.
A. Resonating structures with more number of covalent bonds and lesser charge separation are more stable.
B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E e...
A. Resonating structures with more number of covalent bonds and lesser charge separation are more stable.
B. In electromeric effect, an unsaturated system shows +E effect with nucleophile and -E e...
MCQ+4 / -12026
20Basics Of Organic Chemistry
Given below are two statements :
Statement I : There are several conformers for n -butane. Out of those conformers,
Statement II : As the dihedral angle increases, torsional strain decreases from (X) to $(\mathrm{Y})$.
In the light of the ...
Statement I : There are several conformers for n -butane. Out of those conformers,
Statement II : As the dihedral angle increases, torsional strain decreases from (X) to $(\mathrm{Y})$.
In the light of the ...
MCQ+4 / -12026
21Basics Of Organic Chemistry
Given below are two statements :
Statement I : Sublimation is used for the separation and purification of compounds with low melting point.
Statement II : The boiling point of a liquid increases as the external pressure is reduced. In the l...
Statement I : Sublimation is used for the separation and purification of compounds with low melting point.
Statement II : The boiling point of a liquid increases as the external pressure is reduced. In the l...
MCQ+4 / -12026
22Basics Of Organic Chemistry
Given below are two statements :
Statement I : $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3$ as nine hyperconjugation interactions are possible in $\left(\mathr...
Statement I : $\left(\mathrm{CH}_3\right)_3 \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_3$ as nine hyperconjugation interactions are possible in $\left(\mathr...
MCQ+4 / -12026
23Basics Of Organic Chemistry
\(\text { The IUPAC name of the following compound is : }\)
MCQ+4 / -12026
24Basics Of Organic Chemistry
\(\text { From the following, the least stable structure is : }\)
MCQ+4 / -12026
25Basics Of Organic Chemistry
Identify correct statements from the following :
A. Propanal and propanone are functional isomers.
B. Ethoxyethane and methoxypropane are metamers.
C. But-2-ene shows optical isomerism.
D. But-1-ene and but-2-ene are functional isomers.
E. ...
A. Propanal and propanone are functional isomers.
B. Ethoxyethane and methoxypropane are metamers.
C. But-2-ene shows optical isomerism.
D. But-1-ene and but-2-ene are functional isomers.
E. ...
MCQ+4 / -12026
26Basics Of Organic Chemistry
Given below are four compounds :(a) n-propyl chloride (b) iso-propyl chloride(c) sec-butyl chloride (d) neo-pentyl chloridePercentage of carbon in the one which exhibits optical isomerism is :
MCQ+4 / -12026
27Basics Of Organic Chemistry
Match List - I with List - II.
List - IPair of Compounds
List - IIType of Isomers
A. 2-Methylpropene and but-1-ene
I. Stereoisomers
B. Cis-but-2-ene and trans-but-2-ene
II. Position isome...
List - IPair of Compounds
List - IIType of Isomers
A. 2-Methylpropene and but-1-ene
I. Stereoisomers
B. Cis-but-2-ene and trans-but-2-ene
II. Position isome...
MCQ+4 / -12026
28Basics Of Organic Chemistry
What is the correct IUPAC name of the compound?
MCQ+4 / -12025
29Basics Of Organic Chemistry
Match the LIST-I with LIST-II
LIST-I LIST-II A. Carbocation I. Species that can supply a pair of electrons. B. C-Free radical II. Species that can receive a pair of electrons. C. Nucleophile III. sp2 hybridized carbon with empty ...
LIST-I LIST-II A. Carbocation I. Species that can supply a pair of electrons. B. C-Free radical II. Species that can receive a pair of electrons. C. Nucleophile III. sp2 hybridized carbon with empty ...
MCQ+4 / -12025
30Basics Of Organic Chemistry
Which of the following is the correct IUPAC name of given organic compound (X)?
MCQ+4 / -12025
31Basics Of Organic Chemistry
The number of optically active products obtained from the complete ozonolysis of the given compound is :
MCQ+4 / -12025
32Basics Of Organic Chemistry
The descending order of basicity of the following amines is :
(D) $ \mathrm{CH}_3 \mathrm{NH}_2$
(E) $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$
Choose the correct answer from the options given below :
(D) $ \mathrm{CH}_3 \mathrm{NH}_2$
(E) $\left(\mathrm{CH}_3\right)_2 \mathrm{NH}$
Choose the correct answer from the options given below :
MCQ+4 / -12025
33Basics Of Organic Chemistry
The correct order of basicity for the following molecules is :
MCQ+4 / -12025
34Basics Of Organic Chemistry
In which pairs, the first ion is more stable than the second?
MCQ+4 / -12025
35Basics Of Organic Chemistry
The IUPAC name of the following compound is:
MCQ+4 / -12025
36Basics Of Organic Chemistry
\(\text { The least acidic compound, among the following is: }\)
MCQ+4 / -12025
37Basics Of Organic Chemistry
\(\text {Identify the correct statements from the following. }\)
\(\text {Choose the correct answer from the options given below: }\)
\(\text {Choose the correct answer from the options given below: }\)
MCQ+4 / -12025
38Basics Of Organic Chemistry
Given below are two statements :
Statement I : Hyperconjugation is not a permanent effect.
Statement II : In general, greater the number of alkyl groups attached to a positively charged Cation, greater is the hyperconjugation interaction an...
Statement I : Hyperconjugation is not a permanent effect.
Statement II : In general, greater the number of alkyl groups attached to a positively charged Cation, greater is the hyperconjugation interaction an...
MCQ+4 / -12025
39Basics Of Organic Chemistry
The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula $\mathrm{C}_9 \mathrm{H}_{12}$ is________.
INTEGER+4 / -12025
40Basics Of Organic Chemistry
\(\text { What is the correct IUPAC name of }\)
?
?
MCQ+4 / -12025
41Basics Of Organic Chemistry
Designate whether each of the following compounds is aromatic or not aromatic.
MCQ+4 / -12025
42Basics Of Organic Chemistry
Consider the following compound (X)
The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding $\mathrm{C}-\mathrm{H}$ bond are :
The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of corresponding $\mathrm{C}-\mathrm{H}$ bond are :
MCQ+4 / -12025
43Basics Of Organic Chemistry
In 3,3-dimethylhex-1-en-4-yne, there are _________$\mathrm{sp}^3$,_________$\mathrm{sp}^2$ and_________ sp hybridised carbon atoms respectively.
MCQ+4 / -12025
44Basics Of Organic Chemistry
Total number of nucleophiles from the following is :
MCQ+4 / -12025
45Basics Of Organic Chemistry
Match List - I with List - II.
List - I (Structure)
List - II (IUPAC Name)
(A)
(I) 4-Methylpent-1-ene
(B) (CH3)2C(C3H7)2
(II) 3-Ethyl-5-methylheptane
(C)
(III) 4,4-Dimethylheptane
...
List - I (Structure)
List - II (IUPAC Name)
(A)
(I) 4-Methylpent-1-ene
(B) (CH3)2C(C3H7)2
(II) 3-Ethyl-5-methylheptane
(C)
(III) 4,4-Dimethylheptane
...
MCQ+4 / -12025
46Basics Of Organic Chemistry
Given below are two statements :
Statement (I): On nitration of m-xylene with $\mathrm{HNO}_3, \mathrm{H}_2 \mathrm{SO}_4$ followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product.
Statement (II) : $-\mat...
Statement (I): On nitration of m-xylene with $\mathrm{HNO}_3, \mathrm{H}_2 \mathrm{SO}_4$ followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product.
Statement (II) : $-\mat...
MCQ+4 / -12025
47Basics Of Organic Chemistry
The correct order of stability of following carbocations is :
MCQ+4 / -12025
48Basics Of Organic Chemistry
Given below are two statements:Statement I: and are isomeric compounds.Statement II: and are functional group isomers.In the light of the above statements, choose the correct answer from the options given below:
MCQ+4 / -12025
49Basics Of Organic Chemistry
Which one of the carbocations from the following is most stable?
MCQ+4 / -12025
50Basics Of Organic Chemistry
In the given structure, number of sp and $\mathrm{sp}^2$ hybridized carbon atoms present respectively are :
MCQ+4 / -12025