Organic Chemistry Mock Test – Class 11 Chemistry

1. A record compares and . The locants and are essential because they tell:

2. In a tetrahedral representation, two bonds are shown as ordinary lines, one as a solid wedge, and one as a dashed wedge. The purpose of using all three styles is mainly to show:

3. A proposed pair of resonance structures changes the position of an oxygen atom from one carbon to another. What is the best judgement?

4. A cyclohexene ring has one methyl group attached to one of the double-bonded carbons. The most suitable locant pattern is:

5. A group attached to an organic skeleton strongly withdraws electron density. In electronic-effect language, it is mainly:

6. A molecule is heated with a suitable dehydrating agent to form and . The reaction type is:

7. Ethene, , does not show geometrical isomerism because:

8. The pair and represents chain isomerism because:

9. Combusting of an organic compound gives of and of . If the compound contains only , , and , what is the approximate percentage of oxygen?

10. Sodium fusion is used before testing nitrogen, sulfur, or halogens in an organic compound mainly because:

11. Use the arrangement described below: a tetrahedral carbon is drawn with two bonds in the plane of the paper, one solid wedge bond, and one dashed wedge bond. The solid wedge bond represents a bond:

12. A planar carbon centre has three groups arranged around it, and one of the bonds from that carbon is part of a group. The most suitable local description of that carbon is:

13. Consider these three molecules:

As the carbon-carbon bond changes from P to R, the number of hydrogen atoms decreases because:

14. Simple distillation is most suitable when:

15. In Kjeldahl estimation, of an organic compound is digested and the liberated is absorbed in of . The excess acid requires of . Treat as diprotic. What is the percentage of nitrogen?

16. Steam distillation is especially useful for separating an organic compound that is:

17. Study the classification table.

Which row contains the unsuitable claim?

18. A reagent approaches a molecule containing . Once the reagent is removed before reaction, the temporary electron displacement disappears. Which effect is being described?

19. A hydrocarbon is known to be an open-chain alkyne with one bond. Its molar mass is . Using and , what is its molecular formula?

20. Read the case below and answer the question.

The reaction types in Step P, Step Q, and Step R are respectively:

21. Assertion: Addition reactions are common for alkenes.
Reason: The -bond of an alkene can be broken while new -bonds form to the atoms being added.

22. The formula represents ethene. If the two carbon atoms are joined by a double bond, the bonding around the carbon skeleton is best described as:

23. A formula fragment is . It should be identified as:

24. A steam distillation of an organic liquid immiscible with water gives a distillate containing water and organic liquid. At the same temperature, and . What is the molar mass of the organic liquid? Use .

25. A student performs the halogen test on sodium fusion extract without first boiling it with dilute . The extract gives a precipitate with . Why is the conclusion about halogen unsafe?

26. Consider the following carbon frameworks:

What do all three frameworks show?

27. A cleaner dataset for the same type of compound gives , , , and in a sample. The vapour density is . What is the molecular formula?

28. A reaction description says that compounds with release more readily than comparable compounds containing only as an alcohol group. The statement mainly reflects the role of:

29. A solute has distribution coefficient . A aqueous solution is shaken once with ether. What fraction of solute is extracted into ether?

30. For a monosubstituted cycloalkane such as , why is the locant usually unnecessary?

31. An organic compound containing only , , , and gives and from of sample. In a Dumas estimation, of the compound gives of dry at . If the molar mass is , what is the molecular formula?

32. A proposed structure for a neutral carbon compound shows one carbon atom with five single covalent bonds. What is the best judgement at this level?

33. The pair and is a useful first example of structural isomerism because:

34. Free radicals are generally formed when:

35. A compound has the name . Which statement about the name is correct?

36. Read the case below and answer the question.

What is the name of the second structure if it is a straight-chain ketone?

37. The structure is best named as:

38. In Carius estimation of halogens, the organic compound is heated with fuming and . Chlorine present in the compound is finally weighed as:

39. A seven-carbon acyclic hydrocarbon is named . What formula and molar mass are consistent with the name? Use and .

40. Study the table and choose the row with the unsuitable functional-group identification.

41. A formula is sometimes seen near formulas of alkynes, but when it represents benzene it is classified separately as:

42. A compound is in the saturated monocarboxylic acid series. The previous homologue in the same series should have:

43. A molecule contains two carbon atoms and two hydrogen atoms, and each carbon obeys valency . What carbon-carbon bond is required between the two carbon atoms?

44. When a sodium fusion extract gives a black precipitate with lead acetate after acidification with acetic acid, the precipitate is:

45. A carbocation is best described as:

46. Consider the following statements about substitutive nomenclature.
Statement I: A halogen substituent is usually named with a prefix such as or .
Statement II: A nitro group is usually named with the prefix .
Statement III: A carboxylic acid group is normally ignored when a nitro group is present.
Which statements are valid?

47. The group in an organic compound is called:

48. In the fragment , the inductive effect of chlorine is best described as:

49. The greater stability of over can be partly explained by:

50. A steam-distillation setup contains an organic liquid immiscible with water. At the distillation temperature, the vapour pressures are and . If atmospheric pressure is , what conclusion is correct?