JEE Question Paper Class 11 Organic Chemistry Chapter-1

Here students will find some of the important questions from the chapter of Organic chemistry that is included in the JEE syllabus. However, students are advised to first try and solve the questions by themselves and then analyse their answers with the solutions given.

Important Questions On Some Basic Principles And Techniques In Organic Chemistry

I. Multiple Choice Questions (with one correct answer)

Q1. Which of the following properties is not true regarding organic compounds?

1. They are generally covalent compounds
2. They have high melting and boiling points
3. They are generally insoluble in water
4. They usually show isomerism

Q2. Which of the following properties of carbon is mainly responsible for its ability to form a large number of compounds?

1. Quadri Covalency
2. Ability to form multiple bonds
3. Ability to form ring compounds
4. Strong catenation property

Q3. Which of the following is an aromatic compound?

1. Furan
2. Anthracene
3. Pyridine
4. All are aromatic

Q4. Which of the following is not a carbocyclic compound?

1. Cyclopentane
2. Naphthalene
3. Thiophene
4. Benzene

Q5. The IUPAC name of C₆H₅COCl is

1. Chlorobenzyl ketone
2. Benzene chloroketone
3. Benzenecarbonyl chloride
4. Chlorophenyl ketone

Q6. Which of the following does not contain fused benzene rings?

1. Naphthalene
2. Anthracene
3. Diphenyl
4. Phenanthrene

Q7. The IUPAC name of the compound CH₂N₂ is

1. Methylene nitride
2. Diazomethane
3. Methylene nitrile
4. Methylene isonitrile

Q8. The correct IUPAC name of CH₃CH₂CH(CH₃)CH (C₂H₅) is

1. 4-Ethyl-3-methylhexane
2. 3-Ethyl-4-methylhexane
3. 4-Methyl-3-ethylhexane
4. 2,4- Diethylpentane

Q9. A mixture of acetone and methanol can be separated by

1. Vacuum distillation
2. Steam distillation
3. Fractional distillation
4. Simple distillation

Q10. Lasseigne’s test for the detection of nitrogen fails in

1. NH₂CONHNH₂.HCl
2. NH₂NH₂.HCl
3. NH₂CONH₂
4. C₆H₅NHNH₂.HCl

Q11. In organic compounds, sulphur is estimated as

1. BaSO₄
2. BaCl₂
3. Ba₃(PO₄)₂
4. H₂SO₄

Q12. Which of the following species is an electrophile?

1. H₂O
2. NH₃
3. C₂H₅OH
4. SO₃

Q13. Which of the following does not show the electromeric effect?

1. Alkenes
2. Ethers
3. Aldehydes
4. Ketones

Q14. Tautomerism will be exhibited by

1. (CH₃)₃CNO
2. (CH₃)₂NH
3. R₃CNO₂
4. RCH₂NO₂

Q15. The most stable conformation of 2-chloro ethanol is

1. Skew
2. Staggered
3. Eclipsed
4. Gauche

II. Matching Type Questions (match the entries in column I with column II)

Q1.

1. A-p; B-q; C-r; D-s
2. A-r; B-p; C-q; D-s
3. A-r; B-p; C-s; D-q
4. A-p; B-r; C-q; D-s

Q2.

1. A-r; B-s; C-p; D-q
2. A-q; B-p; C-r; D-s
3. A-s; B-r; C-p; D-q
4. A-p; B-q; C-s; D-r

III. Multiple Choice Questions (with more than one correct answer)

Q1. The correct IUPAC names of di-tert-butyl ether are

1. 2-Methyl-(2-methyl-2-propoxy)propane
2. Bis(2-methyl-2-propoxy)ether
3. 2-Methyl-2-(1, 1-dimethylethoxy)propane
4. 2-Methyl-2-(2-propoxy)propane

Q2. The compound, (CH₃)C(OH)CH₂CH₃ may be called as

1. 2-Methylbutan-2-ol
2. Ethyldimethylcarbinol
3. tert-Pentyl alcohol
4. Isoamyl alcohol

Q3. Cis-2-butene and trans-2-butene are

1. Geometrical isomers
2. Diastereomers
3. Enantiomers
4. Position isomers

Q4. Which of the following act both as a nucleophile as well as an electrophile?

1. CH₃CN
2. HCHO
3. CH₃Cl
4. CH₃OH

Q5. Which of the following compounds use only sp²– hybridised carbons for bonding?

1. 1,3-Butadiene
2. Ethene
3. Benzene
4. Ethyne

IV. Linked Comprehension Type Questions (multiple choice questions)

Comprehension 1:

A mixture of two organic compounds (solids, liquids or a mixture of the two) can be separated by a number of methods depending upon their nature. Simple distillation is used when their boiling points differ by 30^o to 50^o while fractional distillation is used when their boiling points differ by about 10^o-15^o. Steam distillation is used when one of the components of the mixture is steam volatile.

Q1. Simple distillation can be used to separate

1. a mixture of benzene (b.p. 80^o C) and thiophene (b.p. 84^o C)
2. a mixture of ethanol (b.p. 78.1 ^o C) and water (b.p. 100 ^o C)
3. a mixture of ether (b.p. 35 ^o C) and toluene (b.p. 110 ^o C)
4. none of the above

Q2. Refining of petroleum involves the process of

1. simple distillation
2. fractional distillation
3. steam distillation
4. distillation under reduces pressure

V. Matrix-match Type Questions (entries in column I can have one or more correct options from column II)

Q1.

Q2.

VI. Assertion Reason Type Questions (follow directions as given below)

1. Statement-1 & statement-2 are true; statement-2 is the correct explanation for the statement-1
2. Statement-1 & statement-2 are true; statement-2 is not the correct explanation for the statement-1
3. Statement-1 is true statement-2 is false
4. Statement-1 is false statement-2 are true

Q1. Statement 1: alkanes containing more than three carbon atoms exhibit chain isomerism.

Statement 2: all the carbon atoms in alkanes are sp-hybridized

Q2. Statement 1: free radicals are paramagnetic

Statement 2: free radicals contain an unpaired electron

Solutions: (Check your answers)

I.Multiple Choice Questions (with one correct answer)

Q1. Ans. b

Solution: organic compounds generally have low m.p. & b.p.

Q2. Ans. d

Q3. Ans. d

Q4. Ans. C

Solution: thiophene contains S-atom along with C-atoms, so known as heterocyclic compound

Q5. Ans. C

Q6. Ans. C

Solution: diphenyl are two C₆H₅ rings bonded by a single bond

Q7. Ans. b

Solution: two hydrogen atoms of CH₄ are replaced by N-atoms

Q8. Ans. b

Q9. Ans. C

Solution: acetone b.p. is 56^o C, methanol b.p. is (65^oC), the difference in b.p. is only 9^oC, so fractional distillation will be used for separation.

Q10. Ans. b

Solution: C is required for the formation of NaCN, which is not present in NH₂NH₂.HCl

Q11. Ans. a

Q12. Ans. d

Solution: in resonating structures of SO₃, positive charge comes on S-atom, so it acts as an electrophile

Q13. Ans. b

Solution: ethers do not have multiple bonds, so they do not show the electromeric effect

Q14. Ans. d

Solution: RCH₂NO₂ contains α-hydrogen atoms, so it shows tautomerism

Q15. Ans. d

Solution: gauche form is most stable due to H-bonding in 2-chloroethanol

II. Matching Type Questions (match the entries in column I with column II)

Q1. Ans. b

Q2. Ans. a

III. Multiple Choice Questions (with more than one correct answer)

Q1. Ans. a, c

Q2. Ans. a, b, c

Q3. Ans. a, c

Solution: Geometrical isomers are also Diastereomers

Q4. Ans. a,b

Q5. Ans. a,b,c

Solution: ethyne uses sp

IV Linked Comprehension Type Questions (multiple choice questions)

Q1. Ans. C

Q2. Ans. b

V. Matrix-match Type Questions (entries in column I can have one or more correct options from column II)

Q1. Ans. A-r,s; B-q,r; C-s; D-p,s

Q2. Ans. A-s; B-q; C-p,s; D-q,r,s

VI. Assertion Reason Type Questions (follow directions as given below)

Q1. Ans. C

Solution: all the C- atoms in alkanes are sp³-hybridised

Q2. Ans. a

Practising this paper will surely help students to gain confidence for the final IIT JEE exam.

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