Class 10 Practice Level 3 – Carbon and its Compounds – Set – 2 Leave a Comment / By anushka kumari / July 30, 2024 Class 10 Practice Level 3 – Carbon and its Compounds – Set – 2 Total questions: 15 1. Which of the following alkenes will react fastest with HBr? Topic: Electrophilic Substitution Ethene Propene 1-Butene 2-Methylpropene None 2. Which of the following intermediates is formed during the nitration of benzene? Topic: Reaction Intermediates Benzyl carbocation Phenyl radical Nitronium ion Benzyne None 3. Which of the following compounds does not exhibit aromaticity? Topic: Aromatic Compounds Pyrrole Furan Thiophene Cycloheptatrienyl cation None 4. Which type of spectroscopy is most useful for determining the functional groups present in an organic molecule? Topic: Spectroscopy NMR spectroscopy IR spectroscopy UV-Vis spectroscopy Mass spectrometry None 5. In the E2 elimination reaction, which factor does not influence the reaction rate? Topic: Reaction Mechanisms Strength of the base Concentration of the substrate Presence of a polar solvent Leaving group ability None 6. Which conformation of cyclohexane is the most stable? Topic: Conformational Analysis Boat Chair Twist-boat Half-chair None 7. Which reagent is used to convert a primary alcohol to an alkyl halide? Topic: Organic Synthesis KMnO₄ PCC H₂SO₄ PBr₃ None 8. Which of the following substituents on a benzene ring activates the ring towards electrophilic substitution? Topic: Electrophilic Substitution -NO₂ -CF₃ -NH₂ -CN None 9. Which of the following intermediates is formed during the Friedel-Crafts acylation of benzene? Topic: Reaction Intermediates Benzyl carbocation Phenyl radical Acylium ion Benzyne None 10. What is the hybridization of carbon in the carbonyl group of a ketone? Topic: Hybridization sp sp² sp³ dsp² None 11. Which type of spectroscopy is most useful for determining the structure of a compound based on hydrogen environments? Topic: Spectroscopy NMR spectroscopy IR spectroscopy UV-Vis spectroscopy Mass spectrometry None 12. Which reagent is used to selectively oxidize a primary alcohol to an aldehyde without further oxidation to a carboxylic acid? Topic: Organic Synthesis KMnO₄ PCC H₂SO₄ LiAlH₄ None 13. Which of the following reagents is used in the nitration of benzene? Topic: Electrophilic Substitution H₂SO₄ HNO₃ HNO₃/H₂SO₄ HCl/H₂O₂ None 14. In an SN2 reaction, which factor increases the reaction rate? Topic: Reaction Mechanisms Steric hindrance Strength of the leaving group Polar protic solvent Tertiary substrate None 15. Which conformation of 2-butene is more stable? Topic: Conformational Analysis Cis Trans Eclipsed Staggered None 1 out of 15 Time's up
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