JEE Main Part Syllabus Mock Test - Chemistry Organic Chemistry

📋 Test Information

• Exam: JEE Main Part Syllabus Test
• Subject: Chemistry
• Topic: Organic Chemistry (Complete Unit)
• Test Duration: 60 minutes
• Total Questions: 25
• Total Marks: 100
• Question Type: Multiple Choice Questions (MCQs)
• Marking Scheme: +4 for correct, -1 for incorrect

🎯 Syllabus Coverage

Topics Covered:

• Basic Principles of Organic Chemistry
• Hydrocarbons
• Organic Compounds Containing Halogens
• Organic Compounds Containing Oxygen
• Organic Compounds Containing Nitrogen
• Biomolecules
• Polymers
• Chemistry in Everyday Life

Question Distribution:

• Easy Questions: 8 (32 marks)
• Medium Questions: 12 (48 marks)
• Hard Questions: 5 (20 marks)

📝 Test Questions

Section A: Basic Organic Chemistry (Easy-Medium)

Question 1: The IUPAC name of CH₃-CH(CH₃)-CH₂-CH₃ is:

(a) 2-methylpropane (b) 3-methylbutane (c) 2-methylbutane (d) 3-methylpropane

Question 2: Which of the following compounds shows the highest degree of unsaturation?

(a) C₆H₆ (b) C₆H₁₂ (c) C₆H₁₄ (d) C₆H₁₀

Question 3: The hybridization of carbon atoms in ethyne (HC≡CH) is:

(a) sp³ (b) sp² (c) sp (d) dsp²

Question 4: Which of the following is an example of an electrophile?

(a) CN⁻ (b) OH⁻ (c) H⁺ (d) CH₃⁻

Question 5: The correct order of acidity for the following compounds is: I. CH₃COOH II. CCl₃COOH III. CF₃COOH

(a) I < II < III (b) III < II < I (c) II < I < III (d) I = II = III

Question 6: The major product obtained when 2-methyl-1-butene reacts with HBr is:

(a) 2-bromo-2-methylbutane (b) 1-bromo-2-methylbutane (c) 2-bromo-3-methylbutane (d) 1-bromo-3-methylbutane

Question 7: Which of the following reagents converts primary alcohols to aldehydes?

(a) PCC (b) KMnO₄ (c) K₂Cr₂O₇ (d) H₂SO₄

Question 8: The number of π bonds in benzene is:

(a) 1 (b) 2 (c) 3 (d) 6

Section B: Reaction Mechanisms and Applications

Question 9: The mechanism of SN1 reaction involves:

(a) Single step displacement (b) Formation of carbocation intermediate (c) Rearrangement of bonds (d) Formation of radical intermediate

Question 10: Which of the following compounds will undergo nucleophilic substitution reaction most readily?

(a) CH₃CH₂Cl (b) CH₃CH₂F (c) CH₃CH₂I (d) CH₃CH₂Br

Question 11: The major product of the reaction between acetone and NaBH₄ is:

(a) 2-propanol (b) propanal (c) propene (d) propane

Question 12: The correct order of basic strength for the following amines in aqueous solution is: I. (CH₃)₂NH II. (CH₃)₃N III. (CH₃)₂NH₂⁺

(a) I > II > III (b) II > I > III (c) III > I > II (d) I > III > II

Question 13: The polymer formed by the polymerization of styrene is:

(a) Teflon (b) Polystyrene (c) PVC (d) Polythene

Question 14: Which of the following carbohydrates gives a positive Tollens test?

(a) Glucose (b) Sucrose (c) Starch (d) Cellulose

Question 15: The reaction of phenol with bromine water gives:

(a) Monobromophenol (b) 2,4,6-tribromophenol (c) 2,4-dibromophenol (d) 4-bromophenol

Question 16: The product formed when ethanol reacts with concentrated H₂SO₄ at 140°C is:

(a) Ethene (b) Diethyl ether (c) Ethyl hydrogen sulfate (d) Acetaldehyde

Question 17: Which of the following is a non-biodegradable polymer?

(a) Polythene (b) Cellulose (c) Starch (d) Protein

Question 18: The reaction of benzene with concentrated nitric acid in presence of concentrated sulphuric acid at 50°C gives:

(a) Nitrobenzene (b) Phenol (c) Benzoic acid (d) Chlorobenzene

Question 19: Which of the following compounds is used as an analgesic?

(a) Penicillin (b) Aspirin (c) Streptomycin (d) Tetracycline

Question 20: The reaction of CH₃CH₂Cl with NaOH in aqueous solution gives:

(a) CH₃CH₂OH (b) CH₃CH₂ONa (c) CH₃CH=CH₂ (d) CH₃C≡CH

Section C: Advanced Organic Chemistry

Question 21: The configuration of the compound (CH₃)₂CH-CH(Cl)-CH₃ is:

(a) (2R,3R) (b) (2S,3S) (c) (2R,3S) (d) (2S,3R)

Question 22: The major product of the following reaction is: CH₃-CH=CH₂ + HBr → ? (in presence of peroxides)

(a) 1-bromopropane (b) 2-bromopropane (c) 1,2-dibromopropane (d) Propene

Question 23: The correct order of reactivity towards nucleophilic addition reaction is:

(a) CH₃CHO > CH₃COCH₃ > HCHO > CF₃CHO (b) HCHO > CH₃CHO > CH₃COCH₃ > CF₃CHO (c) CF₃CHO > HCHO > CH₃CHO > CH₃COCH₃ (d) CH₃COCH₃ > CH₃CHO > HCHO > CF₃CHO

Question 24: The number of stereoisomers possible for 2,3-dichlorobutane is:

(a) 2 (b) 3 (c) 4 (d) 5

Question 25: Which of the following reactions is used for the preparation of aryl halides from aromatic compounds?

(a) Wurtz reaction (b) Fittig reaction (c) Sandmeyer reaction (d) Kolbe reaction

🔑 Answer Key

1. (c) 2-methylbutane
2. (a) C₆H₆
3. (c) sp
4. (c) H⁺
5. (a) I < II < III
6. (a) 2-bromo-2-methylbutane
7. (a) PCC
8. (c) 3
9. (b) Formation of carbocation intermediate
10. (c) CH₃CH₂I
11. (a) 2-propanol
12. (a) I > II > III
13. (b) Polystyrene
14. (a) Glucose
15. (b) 2,4,6-tribromophenol
16. (b) Diethyl ether
17. (a) Polythene
18. (a) Nitrobenzene
19. (b) Aspirin
20. (a) CH₃CH₂OH
21. (c) (2R,3S)
22. (a) 1-bromopropane
23. (b) HCHO > CH₃CHO > CH₃COCH₃ > CF₃CHO
24. (b) 3
25. (c) Sandmeyer reaction

📊 Detailed Solutions

Solution 1:

The compound CH₃-CH(CH₃)-CH₂-CH₃ has 4 carbon atoms in the main chain with a methyl substituent at position 2. Therefore, the IUPAC name is 2-methylbutane.

Solution 2:

Degree of unsaturation = (2C + 2 - H)/2 For C₆H₆: (2×6 + 2 - 6)/2 = (12 + 2 - 6)/2 = 8/2 = 4 For C₆H₁₂: (2×6 + 2 - 12)/2 = (12 + 2 - 12)/2 = 2/2 = 1 For C₆H₁₄: (2×6 + 2 - 14)/2 = (12 + 2 - 14)/2 = 0/2 = 0 For C₆H₁₀: (2×6 + 2 - 10)/2 = (12 + 2 - 10)/2 = 4/2 = 2 C₆H₆ has the highest degree of unsaturation.

Solution 3:

In ethyne (HC≡CH), each carbon atom forms one sigma bond with hydrogen and one sigma bond with carbon. The remaining two p orbitals on each carbon overlap to form two pi bonds. Therefore, the hybridization is sp.

[Continue with detailed solutions for key questions…]

🎯 Performance Analysis

Difficulty Breakdown:

• Questions 1-8 (Easy): Test basic nomenclature and fundamental concepts
• Questions 9-20 (Medium): Test reaction mechanisms and applications
• Questions 21-25 (Hard): Test advanced concepts and stereochemistry

Time Management Suggestions:

• Easy questions: 1-2 minutes each
• Medium questions: 2-3 minutes each
• Hard questions: 3-4 minutes each

Score Interpretation:

• 90-100 marks: Excellent performance
• 70-89 marks: Good performance
• 50-69 marks: Average performance
• Below 50 marks: Need improvement

Topic-wise Analysis:

• Basic Principles: Questions 1-5, 21, 24
• Hydrocarbons: Questions 6, 9, 10, 22
• Halogen Compounds: Questions 10, 25
• Oxygen Compounds: Questions 7, 11, 16, 20
• Nitrogen Compounds: Questions 12
• Biomolecules: Questions 14
• Polymers: Questions 13, 17
• Chemistry in Life: Questions 15, 18, 19

💡 Preparation Tips

For Organic Chemistry:

1. Master reaction mechanisms - understand electron flow
2. Learn nomenclature rules thoroughly
3. Practice stereochemistry problems
4. Memorize important reactions and their conditions

Test Strategy:

1. Look for patterns in reactions
2. Use mechanism knowledge to predict products
3. Consider stability of intermediates
4. Check for exceptions to general rules

Common Mistakes to Avoid:

1. Incorrect IUPAC naming
2. Wrong reagent selection
3. Missing stereochemistry considerations
4. Forgetting reaction conditions

Best of luck with your test preparation! ⚗️