Organic Chemistry Mock Test – Class 11 Chemistry

1. A compound is named . What does the name state about its structure?

2. A -bond in an organic molecule is formed mainly by:

3. A molecule undergoes heterolytic cleavage of the bond. What are the formal charges on the carbon-containing fragment and chlorine-containing fragment?

4. A -only compound gives , , and bromine by difference from a sample. If its molar mass is , what is the molecular formula?

5. Study the following reaction descriptions.

Which row contains the unsuitable classification?

6. For , the total number of -bonds and -bonds is:

7. An open-chain hydrocarbon has the formula . Which class fits the formula best?

8. A molecule has the condensed formula . The best IUPAC name is:

9. A hydrocarbon has the IUPAC name . What is its molecular formula and molar mass? Use and .

10. Combustion and Dumas data are given for an organic compound containing only , , , and . A sample gives and , while of the same compound gives dry at . If its molar mass is , what is the molecular formula?

11. The reaction is best classified as:

12. In a separating funnel containing ether and water, the organic layer is not always the upper layer. The layer position must be decided mainly from:

13. A compound contains . What is the most suitable functional-group class?

14. Use the arrangement described below: one central carbon is connected by single bonds to four surrounding hydrogen atoms, and no lone pair is shown on carbon. This arrangement represents the bonding pattern of:

15. Study the following pairs.

Which claim is unsuitable?

16. A compound named is checked for formula and molar mass. What is the correct result? Use , , , and .

17. A sodium fusion extract gives a violet colour with sodium nitroprusside and, after separate treatment with dilute followed by , gives a pale yellow precipitate partly soluble in . What elements are indicated?

18. Read the case below and answer the question.

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

19. A distillation curve is drawn for a pure liquid. The temperature remains nearly constant while most of the liquid distils. What does the horizontal region most strongly indicate?

20. When a compound has both and prefixes, the prefixes are arranged alphabetically in the name. Which name follows this rule correctly?

21. The name indicates:

22. A sequence converts to , and then to . The two reaction types in order are:

23. A disubstituted cyclohexane has bromo and methyl groups on adjacent ring carbons. Which name best follows numbering and alphabetical prefix order?

24. The statement most strongly connected with the diversity of organic compounds is:

25. A sulfur-containing organic compound gives of . What is the percentage of sulfur? Use , , and .

26. The condensed formulas and have the same molecular formula . Their difference is best described as:

27. Before testing halogens in sodium fusion extract with , the extract is boiled with dilute . The main reason is to:

28. Study the classification table.

Which row contains the unsuitable claim?

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

30. A tetrahedral carbon is attached to four different groups: , , , and . Why can a wedge-dash drawing be more informative than a simple condensed formula?

31. A sample of an organic compound gives of dry at by the Dumas method. If the sample mass is , what is the percentage of nitrogen? Use at as .

32. A benzene ring has two substituents, and , on adjacent ring carbons. The locant pattern and alphabetical prefix order give the name:

33. A compound containing only , , and gives and from sample. A separate Carius estimation gives from sample. What empirical formula is obtained? Use , , , and .

34. Complete combustion of a organic compound gives of . What percentage of carbon is present? Use and .

35. The compounds and have the same formula . Their structural relationship is:

36. A molecule has a carbon chain and a terminal group . What is the most suitable family classification?

37. A hydrocarbon substituent has molar mass and is known to be a monovalent alkyl group. Using and , identify the group.

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

39. A compound has empirical formula . On combustion, of the compound gives of and of . Its molar mass is . What molecular formula should be assigned?

40. A molecule has two labelled carbon atoms. Carbon P is in a group, while carbon Q is in a group. The better comparison is:

41. A group such as attached to a benzene ring withdraws electron density by resonance. This behaviour is called:

42. An organic compound is analysed as follows: carbon and hydrogen are found by combustion, nitrogen by Dumas method, and chlorine by Carius method. Oxygen is then calculated by difference. Which condition is essential for the oxygen-by-difference step?

43. Two mirror-image models of a molecule cannot be placed exactly on top of each other in the same orientation. This description is most closely connected with:

44. A complete structural formula is preferred over a molecular formula when the purpose is to know:

45. A compound has empirical formula . Its molar mass is . What molecular formula follows?

46. A sample gives the following data:

If the compound contains only , , , and , what mass of oxygen is present in the sample?

47. A mixture gives only one visible spot in a chromatography experiment. Which conclusion is safest?

48. A tetrahedral carbon is attached to , , , and . The molecule does not have a chiral carbon at that atom because:

49. The stability order of the simple alkyl carbocations , , , and is:

50. A compound with formula is a saturated open-chain alcohol. One structure has the group on a terminal carbon of a straight four-carbon chain, and another has it on the second carbon of the same straight chain. What relationship is described?