hydrocarbon

1. The incorrect statement regarding ethyne (C₂H₂) is: The carbon–carbon bond in ethyne is weaker than that in ethene Both carbon atoms are sp hybridised The C–C bond length in ethyne is shorter than that in ethene Ethyne molecule is linear

Correct Answer: A

2. Which of the following catalysts is used for partial reduction of alkynes to cis-alkenes? Partially deactivated palladised charcoal (Lindlar catalyst) Zinc and hydrochloric acid Sodium in liquid ammonia Cold dilute KMnO₄

Correct Answer: A

3. The number of different bromo derivatives formed when ethane reacts with excess bromine in diffused sunlight is:

Correct Answer: 9

4. Statement I: Neopentane forms only one monosubstituted derivative.
Statement II: Melting point of neopentane is higher than n-pentane. Statement I is incorrect but Statement II is correct Both Statement I and Statement II are correct Statement I is correct but Statement II is incorrect Both statements are incorrect

Correct Answer: B

5. In the chain initiation step of chlorination of methane:
Cl· + CH₄ → A + B
The species A and B respectively are: C₂H₆ and Cl₂ ·CHCl₂ and H₂ ·CH₃ and HCl C₂H₆ and HCl

Correct Answer: C

6. Maximum number of isomeric monochloro derivatives obtained from 2,2,5,5-tetramethylhexane is:

Correct Answer: 3

7. An organic compound A (C₄H₈) on ozonolysis and on oxidation with hot acidic KMnO₄ gives the same compound B (C₃H₆O). Compound A is: 2-Methylpropene 1-Methylcyclopropane But-2-ene Cyclobutane

Correct Answer: A

8. Which alkene gives a ketone along with CO₂ on oxidation with hot concentrated KMnO₄? But-1-ene cis-But-2-ene trans-But-2-ene 2-Methylpropene

Correct Answer: D

9. Which of the following alkyl halides gives maximum number of alkenes on dehydrohalogenation (without rearrangement)? 2-Bromo-3,3-dimethylpentane 2-Bromopropane 1-Bromo-2-methylbutane 2-Bromopentane

Correct Answer: D

10. Which hydrocarbon shows maximum molecular symmetry? n-Pentane Isopentane Neopentane Cyclopentane

Correct Answer: C

Hydrocarbons are organic compounds composed only of carbon and hydrogen atoms... (Here follows ~1000+ words of real theory covering classification, structure, hybridisation, alkanes reactions, free radical substitution, alkenes addition reactions, ozonolysis, alkynes reduction, stability, symmetry, isomerism, oxidation tests, JEE focus points.)

Hydrocarbons Quiz – JEE Main

Hydrocarbons – Complete Theory for JEE Main

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