Th Grades Chemistry Questions

1. What is the main element of organic compounds?
1. Hydrogen
2. Carbon
3. Nitrogen
4. Oxygen

1. Which types of bonds and how many of each are found in the following compound

H-C≡C-H?

A. 5σ- bonds

B. 4σ- and 1 π- bonds

C. 3σ- and 2π- bonds

D. 5 π- bonds

1. What is the general formula of alkenes?
1. C_nH_2n+2
2. C_nH_2n
3. C_nH_2n-2
4. C_nH_2n-1

1. What is the name of the following compound

1. hexane
2. 2,3-dimethyl-2-butene
3. 2,3-dimethyl-2-pentene
4. Dimethylbutene

1. 0,1 mole of an alkyne weighs 4 grams. What is the molecular formula of an alkyne?

A. C₃H₄ B. C₃H₆ C. C₂H₂ D. C₄H₆

1. What is the name of the product of the following reaction:

CH₃-CH ═CH₂ + HCl → ……………

1. 1-chloropropane
2. 2-chloropropane
3. 1-chloropropene
4. Propane

1. Which one of the following compounds is an isomer of CH₃-CH═CH-CH₃?
1. CH≡C-CH₂-CH₃
2. CH₂═ CH-CH₂-CH₃
3. CH₃-CH₂-CH₂-CH₃
4. CH₃-CH═CH₂

1. Which one of the followings does not react with propyne?
1. Hydrogen
2. Chlorine
3. Water
4. Methane
2. Calculate mass of methane produced from 14,4 grams of aluminum carbide according to the following reaction: Al₄C₃ + 12H₂O → 4Al(OH)₃ + 3CH₄ (Al: 27, C: 12, H: 1, O:16)

A. 1,6 g B. 3,2 g C. 4,8 g D. 6,4 g

1. In which pair of compounds there are homologous?
1. CH₄ and CH₃-CH₃
2. CH₂═ CH₂ and CH₃-CH₃
3. CH₂═ CH₂ and CH≡CH
4. CH≡CH and CH₃-CH₃

1. Who is the author of “The Structural Theory of Organic Compounds”?
1. M.Lomonosov
2. A.Butlerov
3. V.Markovnikoff
4. D.Mendeleev

1. Which types of bonds and how many of them are found in CH₂═CH₂?
1. 1π- and 5σ- bonds
2. 6σ- bonds
3. 2π- and 4σ- bonds
4. 6π – bonds

1. What is the general formula of alkynes?

A. C_nH_2n+2

B. C_nH_2n

C. C_nH_2n-2

D. C_nH_2n-1

14. What is the name of the following compound?

1. 2,4-dimethyl-2-pentene
2. 2,4-dimethyl-3-pentene
3. Heptyne
4. Dimethylpentene

15. 0,1mole of an alkane weighs 3 grams. What is the molecular formula of an alkane?

A. CH₄ B. C₂H₆ C. C₂H₂ D. C₂H₄

16. What is the name of the product of the following reaction:

CH₃-CH₂-CH═CH₂ + HBr →?

A. 1-bromobutane

B. 1-bromo-1-butene

C. 2-bromobutane

D. butane

17. Which one of the following is an isomer of CH₃-CH₂-CH₂-CH₃?

A. CH₃-CH₃

B. CH₂═ CH-CH-CH₃

C. CH₃-CH-CH₃

|

CH₃

D. CH₃-CH═CH-CH₃

18. Which one of the followings does not react with ethylene?

A. Hydrogen

B. Chlorine

C. Water

D. Methane

19. Calculate mass of acetylene produced from 6,4 grams of calcium carbide according to the following reaction: CaC₂ + 2H₂O = Ca(OH)₂ + C₂H₂?

(Ca: 40, C:12, H:1, O:16)

A. 2,6 g B. 1,3 g C. 3,9 g D. 5,2 g

20. In which pair of compounds there are homologous?

A. CH₄ and CH≡CH

B. CH≡CH and CH₃-CH₃

C. CH₂═CH₂ and CH₃-CH ═ CH₂

D. CH≡CH and CH₂═CH₂

21. Monohydric alcohols do not react with

1. acetic acid C. metallic sodium
2. methane D. oxygen

22. Which one of the following can react with each calcium, sodium hydroxide and ethanol?

A. Propanoic acid B. Propanal

C. Methylpropionate D. Propanol

23. The product of reaction between aldehyde and hydrogen is

A. ester B. alcohol

C. ether D. carboxylic acid

24. What is X in the following scheme 1-chlorobutane → X → 2-butanol

A. butane B. 2-chlorobutane

C. 1-butene D. 1-butanol

25. Which one of the following is an isomer of ethanol?

A. CH₃OH B. CH₃-O-CH₃

1. CH₃CHO D. CH₃CH₂CH₂OH

1. By which reagent aldehydes can be identified?

A. FeCl₃ B. [Ag(NH₃)₂]OH C. BaCl₂ D. NaOH

27. Oxidation of which compounds give ketones?

A. Primary alcohols B. Secondary alcohols

C. Tertiary alcohols D. Ethers

28. Which one of the following is not a monosaccharide?

A. Fructose B. Glucose C. Sucrose D. Galactose

29. Oxidation of methanol produces

1. Methane B. Methanal C. Acetic acid D. Chloromethane

30. Qualitative reaction for polyhydric alcohols is reaction with

A. H₂ B. [Ag(NH₃)₂]OH C. Fe D. Cu(OH)₂

31 Which one of the following is an isomer of 1-butanol?

A. Propanol B. 2-butanol C. Butanal D. Butanone

32. How many grams of acetaldehyde can be prepared from 2,6 grams of acetylene by it’s hydration? (C:12, O:16, H:1)

1. 4,2 grams B. 4,4 grams C. 4,6 grams D.4,0 grams

33. Which one of the following is formic acid

A. CH₃CHO B. CH₃OH C. CH₃CH₂COOH D. HCOOH

34. Which alcohol can be produced by the fermentation of glucose?

A. Methanol B. Ethanol C. Propanol D. Butanol

35. Methanol does not react with

A. Ag B. K C. CuO D. O₂

36. Reaction of monobromoalkane with aqueous base solution produces

A. alkane B. alkene C. alcohol D. aldehyde

37 Which ones are organic compounds?

1. C₂H₂ 2. CaCO₃ 3. C₂H₅OH 4. CO 5 C₂H₅NH₂

A. 1,2,4

B. 1,3,5

C. 2,3,4

D. 2,4,5

38. Which ones are homologous?

A. 1 and 3 B. 2 and 6 C. 2 and 4 D. 4 and 5

39 Name of the following hydrocarbon is

1. 4-ethyl -4-hexene
2. 3-methylheptane
3. 3-ethylhexane
4. 3-ethyl-2-hexene

40 2-chloropropane can be produced by the reaction of

A. propene with Cl₂

B. propene with HCl

C. propyne with HCl

D. cyclopropane with HCl

41 Benzene can react with

1. CH≡CH 2. Br₂ 3. H₂ 4. NaOH 5. O₂

A. 1,2

B. 1,3,5

C. 4,5

D. 2,3,5

42. Compounds X and Y in the following scheme are:

1. CH₃CHO, CH₃COOH
2. CH₂=CH₂, CH₃CHO
3. CH₃COOH, CH₃COOAg
4. CH₃COOH, CH₃CHO

43 An organic compound contains 7,69% of hydrogen and 92,31% of carbon by mass. What is the molecular formula of a compound?

A. C₆H₁₀

B. C₆H₁₂

C. C₄H₈

D. C₆H₆

44. Phenol does not react with

1) sodium hydroxide 2) sodium 3) hydrochloric acid 4) bromine water

45. Which one is not an alcohol?

1) 2-butanol 2) ethanol 3) toluene 4) isopropanol

46. Which compounds have general formula C_nH_2n-2?

1) alkenes and alkynes 2) alkenes and alkadienes

3) alkynes and alkadienes 4) alkadienes and aromatic hydrocarbons (arenes)

47. Benzene can be prepared by trimerization of which hydrocarbon at the presence of carbon?

1) ethane 2) ethylene 3) acetylene 4) propene

48. Which statement is WRONG about alcohols

1) Alcohols can react with oxygen

2) Alcohols can undergo intermolecular dehydration reaction

3) Alcohols can react with bases

4) Alcohols can undergo intramolecular dehydration reaction

49. Qualitative reaction of aldehydes:

1) reduction by hydrogen to alcohols

2) oxidation to carboxylic acids with copper (II) hydroxide solution when heated with formation of red precipitate

3) reaction with bromine water with formation of white precipitate

4) reaction with alcohols with formation of esters

50. How many sigma σ-bonds in propyne molecule?

1) 6 2) 7 3) 8 4) 5

51. Hydrolysis of fats give carboxylic acid and

1) glycerol 2) formaline 3) phenol 4) starch

52. In reaction CH₄ → X → CH₃CHO, what is X?

1) ethane 2) ethylene 3) ethyne 4) ethanol

53. How many kJ of heat will be produced by combustion of 100g of benzene by following reaction C₆H₆ + 7,5O₂ → 6CO₂ + 3H₂O + 3264 Kj

1) 2092 kJ 2) 8368 kJ 3) 6276 kJ 4) 4185 kJ

54. Qualitative reaction for phenol is formation of white precipitate in the reaction with

A. nitric acid B. metallic sodium C. bromine water D. hydrogenbromide

55. Esterification is a reaction of ester formation between

A. carboxylic acid and aldehyde B. carboxylic acid and alcohol

C. carboxylic acid and phenol D. two alcohol molecules

56. How many σ-bonds are in methanal?

A. 1 B. 2 C. 3 D.4

57. Which one is toxic for our organism?

A. glucose B. fructose C. ethanol D. galactose

58. What is X C₂H₂ → X → CH₃COOH?

A. ethanol B. ethanal C. ethylene D. ethane

59. How many kJ of heat will be produced by combustion of 30 liters of acetylen by following reaction C₂H₂ + 2,5O₂ → 2CO₂ + H₂O + 1300 kJ

1) 870,5 kJ 2) 3482 kJ 3) 1741 kJ 4) 4352,5 kJ

60 Which one is methyl radical?

A. CH₃- B. C₂H₅- C. C₃H₇- D. C₄H₉-

61 Methylacetate and propanoic acid are

A. homologous

B. functional isomers

C. geometrical isomers

D. the same compound

62 Which one of the following can react with both water and acidic potassium permanganate solution?

A. CH₄ B. C₂H₄ C. C₆H₆ D. C₆H₅CH₃

63 Acetylene can be produced by the reaction of which of the following with alcohol base solution?

A. chloroethane

B. 1,1-dichloroethane

C. 1,1,2,2-tetrachloroethane

D. Ethylene

64 Ethylformate can be formed by the reaction of

1. methanoic acid and ethyl alcohol
2. acetic acid and methyl alcohol
3. methanoic acid and acetic acid
4. methyl alcohol and ethyl alcohol

65 What is X in the following scheme X+ HBr → CH₃Br + H₂O

A. Methane

B. Chloromethane

C. Methanal

D. Methnol

66 How many grams of acetaldehyde can be prepared from 2,6 grams of acetylene by it’s hydration? (C:12, O:16, H:1)

1. 4,2 grams
2. 4,4 grams
3. 4,6 grams
4. 4,0 grams

67. Weak acidic properties of alcohols and phenol are shown in the reaction with:

A. halogens B. aldehydes C. sodium D. inorganic acid

68. Organic compounds containing –CHO group show properties of:

A. alcohols B. carboxylic acids C. aldehydes D. esters

69. Which statements about carboxylic acids are correct?

1. Carboxylic acids are produced by oxidation of primary alcohols and aldehydes
2. Carboxylic acids undergo hydrolysis reaction

1. only 1^st statement is correct
2. only 2^nd statement is correct
3. both statements are correct
4. both statements are wrong

70. Which one of the followings can show properties of both aldehydes and carboxylic acids?

A. Glucose

B. Acetaldehyde

C. Formic acid

D. Diethylether

71 Which one is product of polymerization of propene?

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