Hydrocarbons Mock Test – Class 11 Chemistry

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

2. Alkynes, like alkanes and alkenes, are generally poorly soluble in water because they are

3. The reagent pair used for hydration of an alkene to an alcohol is commonly represented as

4. A branched alkyl halide undergoes elimination with alcoholic . The major alkene is usually the one that is

5. In electrophilic aromatic substitution of benzene, the step that restores aromaticity is usually

6. A reaction comparison is shown below.

The comparison supports the conclusion that

7. In a combustion analysis, of hydrocarbon gives and . decolourises bromine water and consumes in complete hydrogenation. The most suitable formula and class are

8. A benzene ring already carrying one group undergoes further substitution. The group is generally

9. But--yne and but--yne only are present in a mixture. The mixture consumes of on complete addition. A separate equal sample gives of silver acetylide derivative with ammoniacal silver nitrate. The moles of but--yne are

10. In the same relative-rate comparison of toluene, benzene, and nitrobenzene, the lowest bar should correspond to

11. Methane reacts with chlorine in the presence of light. The first monochlorinated product is

12. A table lists alkenes and their ability to show geometrical isomerism.

The row that needs correction is

13. Ozonolysis of , followed by reductive work-up, gives

14. A set of names and structural meanings is shown below.

The row needing correction is

15. The suitable IUPAC name for is

16. The general Wurtz reaction for a single alkyl halide is best represented as

17. A statement says, “Alkynes and alkenes both undergo addition reactions, so one mole of reagent always completely saturates them.” The best correction is that

18. A chain compound written as is named

19. In and , the main difference is the

20. The decolourisation of dilute alkaline by an alkene is used as a test for

21. Complete hydrogenation converts of into . The hydrogen gas is supplied from a cylinder at . The minimum volume of required is

22. A benzene ring carrying a group is commonly named

23. The suitable name for is

24. The pair and has

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

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

27. During complete hydrogenation, of an open-chain hydrocarbon consumes of . The hydrogenated product on complete combustion gives of . The formula of is

28. A table of alkene names and structures is shown below.

The row that needs correction is

29. A reaction record for alkane halogenation is shown below.

The row that needs correction is

30. The table gives four descriptions. Select the row that gives the best broad classification.

31. Assertion: In ordinary addition of to propene, is the major product.
Reason: The intermediate formed by adding to the terminal carbon is a more stable secondary carbocation.

32. The energy profile for electrophilic addition to an unsymmetrical alkene is often controlled by the relative stability of possible carbocation intermediates. The more favoured path generally forms

33. For addition of to ethene, of ethene reacts completely with excess . The amount of bromoethane formed is

34. A comparison of propene addition products is given below.

The entry that needs correction is

35. Addition of to propene in the absence of peroxide mainly gives

36. A hydrocarbon is named from a parent chain of carbon atoms with only single bonds. The root and suffix combination should be

37. Different spatial arrangements of ethane obtained by rotation around its single bond are called

38. The Wurtz reaction uses alkyl halides with sodium metal in

39. Benzene usually prefers substitution over addition because substitution

40. For straight-chain alkynes in a homologous series, the boiling point generally increases as the carbon number increases mainly because

41. Alkenes are hydrocarbons that contain at least one

42. A table compares physical-property statements for alkenes.

The row that needs correction is

43. A hydrocarbon sample decolourises bromine water and also decolourises cold dilute alkaline . The most likely conclusion is that the sample contains

44. A hydrocarbon test table is shown below.

The row that needs correction is

45. For Kolbe electrolysis of , the main symmetrical alkane product contains how many carbon atoms?

46. A cracking record states:

Assuming only one other hydrocarbon product is formed, the formula of is

47. The dihedral angle between a front bond and the nearest rear bond is in an eclipsed ethane conformation. In the nearest staggered conformation, it becomes

48. In naming an alkene, the parent chain must be chosen so that it

49. The catalyst commonly used in Friedel-Crafts alkylation is

50. Assertion: Wurtz reaction is especially useful for preparing symmetrical alkanes.
Reason: Two identical alkyl halide molecules couple to give one main product.