General Organic Chemistry & Isomerism · JEE Main previous year questions

235 questions asked across 20 exam years, newest first

Year-wise papers Topic-wise questions

Practise this topic

2022 22 questions

Q692022 · 29 Jul 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: C
Q702022 · 29 Jul 2022 · Shift 2
1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are incorrect.
3. C.Statement I is correct but Statement II is incorrect.
4. D.Statement I is incorrect but Statement II is correct.
Show answer
Answer: C
Q672022 · 28 Jul 2022 · Shift 1
1. A.(A) - (II), (B) - (I), (C) - (IV), (D) - (III)
2. B.(A) - (IV), (B) - (III), (C) - (I), (D) - (II)
3. C.(A) - (III), (B) - (IV), (C) - (I), (D) - (II)
4. D.(A) - (IV), (B) - (III), (C) - (II), (D) - (I)
Show answer
Answer: C
Q712022 · 28 Jul 2022 · Shift 1
1. A. $A - CH_{3} CH_{2} CH = CH - CH_{3}$ , $B - CH_{3} CH_{2} CH_{2} CH = CH_{2}$ , Saytzeff products
2. B. $A - CH_{3} CH_{2} CH = CH - CH_{3}$ , $B - CH_{3} CH_{2} CH_{2} CH = CH_{2}$ , Hofmann products
3. C. $A - CH_{3} CH_{2} CH_{2} CH = CH_{2}$ , $B - CH_{3} CH_{2} CH = CHCH_{3}$ , Hofmann products
4. D. $A - CH_{3} CH_{2} CH_{2} CH = CH_{2}$ , $B - CH_{3} CH_{2} CH = CHCH_{3}$ , Saytzeff products
Show answer
Answer: C
Q682022 · 27 Jul 2022 · Shift 1
1. A.Both A and R are correct and R is the correct explanation of A.
2. B.Both A and R are correct but R is NOT the correct explanation of A.
3. C.A is correct but R is not correct.
4. D.A is not correct but R is correct.
Show answer
Answer: D
Q892022 · 27 Jul 2022 · Shift 1· Numerical answer
Optical activity of an enantiomeric mixture is $+ 12. 6^{\circ}$ and the specific rotation of $(+)$ isomer is $+ 3 0^{\circ}$ . The optical purity is _________%.
Show answer
Answer: 42
Q692022 · 26 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: C
Q882022 · 25 Jul 2022 · Shift 2· Numerical answer
The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are $3.25 cm$ , $2.08 cm$ and $1.05 cm$ , respectively. The ratio of $R_{f}$ values of A to B is ____ .
Show answer
Answer: 2
Q792022 · 30 Jun 2022 · Shift 1
TLC analysis of a mixture having 3 components (A, B, C) using silica gel as the stationary phase gave following $R_{f}$ values; for $A = 0.72$ , $B = 0.48$ , $C = 0.20$ . Regarding the above observations, which one of the following statements is not correct for column chromatography of the mixture?
1. A.A is the most non-polar component
2. B.C is the most soluble component in mobile phase
3. C.A will be eluted first
4. D.C is the most strongly absorbed component
Show answer
Answer: B
Q672022 · 28 Jun 2022 · Shift 2
1. A.4-methyl-2-nitro-5-oxohept-3-enal
2. B.4-methyl-5-oxo-2-nitrohept-3-enal
3. C.4-methyl-6-nitro-3-oxohept-4-enal
4. D.6-formyl-4-methyl-2-nitrohex-3-enal
Show answer
Answer: C
Q722022 · 28 Jun 2022 · Shift 2
When sugar 'X' is boiled with dilute $H_{2} S O_{4}$ in alcoholic solution, two isomers 'A' and 'B' are formed. 'A' on oxidation with $HN O_{3}$ yields saccharic acid where as 'B' is laevorotatory. The compound 'X' is :
1. A.Maltose
2. B.Sucrose
3. C.Lactose
4. D.Starch
Show answer
Answer: B
Q862022 · 28 Jun 2022 · Shift 2· Numerical answer
(a) $CoC l_{3} \cdot 4N H_{3}$ , (b) $CoC l_{3} \cdot 5N H_{3}$ , (c) $CoC l_{3} \cdot 6N H_{3}$ and (d) $CoCl (N O_{3})_{2} \cdot 5N H_{3}$ . Number of complex(es) which will exist in cis-trans form is/are ____.
Show answer
Answer: 1
Q702022 · 27 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: A
Q892022 · 27 Jun 2022 · Shift 1· Numerical answer
Total number of possible stereoisomers of dimethyl cyclopentane is ____________.
Show answer
Answer: 6
Q872022 · 26 Jun 2022 · Shift 1· Numerical answer
On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic compound is _____________. (Nearest integer)
Show answer
Answer: 18
Q882022 · 26 Jun 2022 · Shift 1· Numerical answer
Compound 'P' on nitration with dil. $HN O_{3}$ yields two isomers (A) and (B). These isomers can be separated by steam distillation. Isomers (A) and (B) show the intramolecular and intermolecular hydrogen bonding respectively. Compound (P) on reaction with conc. $HN O_{3}$ yields a yellow compound 'C', a strong acid. The number of oxygen atoms is present in compound 'C' ________.
Show answer
Answer: 7
Q682022 · 25 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: C
Q702022 · 25 Jun 2022 · Shift 1
The IUPAC name of ethylidene chloride is :
1. A.1-Chloroethene
2. B.1-Chloroethyne
3. C.1,2-Dichloroethane
4. D.1,1-Dichloroethane
Show answer
Answer: D
Q612022 · 24 Jun 2022 · Shift 2
$120 g$ of an organic compound that contains only carbon and hydrogen gives $330 g$ of $C O_{2}$ and $270 g$ of water on complete combustion. The percentage of carbon and hydrogen, respectively are
1. A.25 and 75
2. B.40 and 60
3. C.60 and 40
4. D.75 and 25
Show answer
Answer: D
Q672022 · 24 Jun 2022 · Shift 2
$PCl_{5}$ is well known, but $NCl_{5}$ is not. because,
1. A.nitrogen is less reactive than phosphorus.
2. B.nitrogen doesn't have d-orbitals in its valence shell.
3. C.catenation tendency is weaker in nitrogen than phosphorus.
4. D.size of phosphorus is larger than nitrogen.
Show answer
Answer: B
Q692022 · 24 Jun 2022 · Shift 2
1. A. $B > A > C$
2. B. $A > B > C$
3. C. $C > B > A$
4. D. $C > A > B$
Show answer
Answer: A
Q852022 · 24 Jun 2022 · Shift 2· Numerical answer
$0.2 g$ of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of $N_{2}$ evolved (at STP) was found to be $22.400 mL$ . The percentage of nitrogen in the compound is . [nearest integer] (Given : Molar mass of $N_{2}$ is $28 g mol^{- 1}$ . Molar volume of $N_{2}$ at STP : $22.4 L$ )
Show answer
Answer: 14