Hydrocarbons Mock Test – Class 11 Chemistry

1. During complete hydrogenation, of an open-chain hydrocarbon absorbs of at and gives an alkane of formula . The formula of is

2. The simplest member of the alkyne series is

3. In the classification map below, the missing entry at is most suitable for which hydrocarbon type?

4. A benzene ring carrying a group is commonly named

5. A preparation route is represented as . This route is useful for preparing alkanes because it

6. In the monochlorination of propane, substitution at a terminal carbon gives

7. The molecular formula of benzene is

8. For monochlorination of methane, the overall reaction is . If of methane is completely converted only to , the amount of consumed is

9. A monohalogenation calculation for propane uses relative reactivities . If propane has primary hydrogens and secondary hydrogens, the approximate percentage of in the monochloro product mixture is

10. The solvent most suitable for dissolving an alkane is generally

11. In the reaction , the role of in soda lime is best described as

12. A preparation scheme changes into an alkane without changing the carbon skeleton. The product is

13. A limitation of using a mixture of two different carboxylate salts in Kolbe electrolysis is that

14. A sample decolourises bromine water, decolourises cold dilute alkaline , and gives no precipitate with ammoniacal . The most reasonable possibility is

15. A route planner wants to prepare butane as the main product. Two possible routes are shown.
Case 1: with
Case 2: by Kolbe electrolysis
The correct comparison is that

16. A hydrocarbon has formula and is known to be an open-chain compound with one triple bond. Its family is

17. A reaction sequence is written as


The products and are respectively

18. Excess adds to ethyne to give a product best represented as

19. In a Newman projection of butane, an eclipsed form with eclipsing is generally

20. In a carbon-carbon double bond of an alkene, the bonding consists of

21. The balanced complete combustion equation for methane is

22. Ethyne reacts with excess bromine. The final saturated product is best represented as

23. A hydrocarbon has one tertiary hydrogen and nine primary hydrogens. On radical bromination, the major monobromo product is expected from replacement of

24. A hydrocarbon is written as . This formula alone tells us

25. A learner claims, “Every hydrocarbon with fewer hydrogen atoms than the corresponding alkane must behave like a simple alkene.” The best response is that

26. The usual stability order of alkyl radicals formed during alkane halogenation is

27. Assertion: Alkenes decolourise bromine solution and alkaline , but the products are not the same.
Reason: Bromine adds bromine atoms across , while alkaline introduces hydroxyl groups under mild oxidation.

28. A hydrocarbon is converted into by adding of per mole of using a controlled catalyst. then consumes of per mole. Complete hydrogenation of would consume of per mole. The best description of and is

29. In ozonolysis, an alkene is first treated with , followed by reductive work-up such as . The reaction is mainly useful for

30. A table compares structural statements about benzene.

The row that needs correction is

31. The characteristic addition reactions of alkenes are mainly due to the presence of

32. Dehydrohalogenation of a vicinal dihalide can prepare an alkyne when

33. Consider these statements about alkene nomenclature.
I. The suffix indicates a carbon-carbon double bond.
II. The parent chain should include the bond.
III. The double bond is numbered to receive the highest possible locant.

34. A table of hydrogenation changes is shown below.

The row that needs correction is

35. A compound is called a hydrocarbon only when its composition is limited to which elements?

36. Cold dilute alkaline reacts with an alkene to form

37. In naming a branched alkane, the parent chain is selected as the

38. A table compares roles in electrophilic addition of to an alkene.

The entry that needs correction is

39. A terminal alkyne and an internal alkyne both decolourise bromine solution, but only the terminal alkyne gives a precipitate with ammoniacal silver nitrate. The difference is due to

40. An alkene can show cis-trans isomerism only when each double-bonded carbon has

41. Reduction of an alkyl halide to an alkane mainly involves replacing the halogen atom by

42. A hydrocarbon sample is described as a chain compound with one carbon-carbon triple bond. Its first broad placement should be

43. The nitro group, , already present on a benzene ring generally directs further electrophilic substitution mainly to the

44. A table compares possible monochlorination outcomes.

The row that needs correction is

45. Formula-and-hydrogenation clues show that hydrocarbon has molecular formula , consumes of per , and has no ring. The most suitable structural class of is

46. A mechanism list contains these steps:
I.
II.
III.
The correct classification is

47. In the conversion sequence , the reagents or conditions for the two steps are respectively

48. A compact passage is given below.

The comparison mainly shows that

49. The relatively higher acidity of terminal alkynes compared with alkenes is mainly due to the

50. Polynuclear aromatic hydrocarbons are best described as aromatic compounds that contain