Acidity and basidity of organic compounds

01. Lewis acids

1. donors of positive protons

2. acceptors of positive protons

3. donors of an electronic pair

4. acceptors of an electronic pair

5. oxonium basis

02. The greatest basic properties shows

1. ethoxy ethanes

2. diethylsulfede

3. diethylamines

4. ethylamine

5. triethylamine

03. The more Ка (constant of an acidity) organic compounds

1. the acidity is higher

2. the acidity is lower

3. the basicity is higher

4. electronegativity of anion there is less

5. the stability of an ion in lead-acid center is lower

04. In order of basicity increase the compounds are arranged in a

row

1. C₂H₅ - O – C₂H₅, C₂H₅ - S – C₂H₅, C₂H₅ - NH – C₂H₅

2. C₂H₅ - S – C₂H₅, C₂H₅ - O – C₂H₅, C₂H₅ - NH – C₂H₅

3. there is no right answer

4. C₂H₅ - NH – C₂H₅, C₂H₅ - O – C₂H₅, C₂H₅ - S – C₂H₅

5. C₂H₅ - NH – C₂H₅, C₂H₅ - S – C₂H₅, C₂H₅ - O – C₂H₅

05. With increase of a delocalization of a negative charge of anion

1. the acidity decreases

2. the repeatability of anion decreases

3. the acidity of compounds increases

4. the basicity of compounds is increased

5. acidities of compounds do not change

06. The Basis of Lewis are:

1. acceptors of an electronic pair

2. donors of an electronic pair

3. compounds with a free orbital

4. donors of positive protons

5. acceptors of positive protons

07 To the greatest acidic properties exhibits

1. ethanol

2. ethane thiol

3. phenol

4. paraftorophenol

5. para-aminophenol

08. Quantitatively acidity of organic compounds is valued

1. stability of an ion

2. constant of an acidity (Ка)

3. constant of a basicity (Kb)

4. С С

Н+, ОН-

5. electronegativity of atom in acid center

09. The greatest basicity shows the compound below:

1. CH₃– NH₂

2. CH₃-OH

3. CH₃- NH– CH₃

4. CH₃- SH

5. CH₃- N– CH₃

|

CH₃

10.Bronsted-Lowry acids are

1.donor of positive protons

2.donor of electrons

3.acceptor of positive protons

4.acceptors of electrons

5.neutral molecule, in which one atom with paired electrons

11. Electron-donors functional groups

1.decrease basicity

2.decrease acidity

3.increase a stability of an ion

4.increase acidity

5.don't influence acidity

12. The greatest basicity has

1.methylamine

2.dimethylamine

3.trifluoromethylamine

4.aniline

5.para-methylaniline

13. The greater the pKa of organical compounds the

1.less the acidity

2.more the basicity

3.less the basicity

4.more the ion stability

5.more the electronegativity of ion in acid centre

14.Electronoacceptors

1.increase the acidity

2.decrease the acidity

3.increase the stability of ion

4.increase the basicity

5.there is no right answer

15. The greatest basicity shows the following compound:

1. CH₃ – NH₂ 4. CH₃OH

2. CH₃ - NH – CH₃ 5. CH₃ - SH

..

3. CH₃- N – CH₃

|

CH₃

16. The least basicity shows

1. diethylamine

2. methyl amine

3. Diethyl ether

4. diethylsulfide

5. ethanol

17. The less the Ka of the organic compound the

1. more is acidity

2. less is acidity

3. less is basicity

4. more stable the anion

5. more is electronegativity of atom in the acid centre

18.By increasing of atom polarization in acid center

1. the stability of anion decreases

2. the acidity of compound decreases

3. the basicity of compound increases

4. the acidity of compound increases

5. the delocalization of negative charge of atom decreases

19. The greatest acidity shows

1. ОН - acid

2. SH - acid

3. NH - acid

4. CH - acid

5. the compounds listed are not acids

20. The least acidic properties shows

1. ethanol

2. Diethyl ether

3. ethane thiol

4. methyl amine

5. Dimethylamine

21. The least acidity shows the following compound

1. acetic acid

2. chloroacetic acid

3. Dichloroacetic acid

4. trichloroacetic acid

5. aminoacetic acid

22. Alkenes – are the bases:

1. ammonium

2. oxonium

3. sulfonium

4. pi-bases

5. neutral

23. In the following reaction HCOOH + H₂O «HCOO^- + H₃О⁺ conjugated acid is:

1. formic acid

2. water

3. formiate ion

4. hydroxonium ion

5. there is no conjugated acid in this reaction

24. In the following equation of the reacion CH₃-COOH + H₂O «CH₃-COO^- + H₃O⁺

the base is:

1. acetic acid

2. water molecule

3. acetate ion

4. hydroxonium ion

5. there is no base in this reaction

25. In order of basicity increase the following compounds are places in the row:

1. СН₃- N- CH₃, CH₃- NH- CH₃, CH₃- NH₂

|

CH₃

2. CH₃- NH₂, CH₃- N- CH₃, CH₃- NH- CH₃,

|

CH₃

3. CH₃- NH- CH₃, CH₃- NH₂, CH₃- N- CH₃

|

CH₃

4. CH₃- NH₂, CH₃- NH- CH₃, CH₃- N- CH₃

|

CH₃

5. there is no correct answer

26. The acidity of the following organic compounds decreases in the row:

1. H-COOH, CH₃-COOH, CH₃-CH₂-COOH

2. CH₃-CH₂-COOH, CH₃-COOH, H-COOH

3. CH₃-CH₂-COOH, H-COOH, CH₃-COOH

4. CH₃-COOH, H-COOH, CH₃-CH₂-COOH

5. H-COOH, CH₃-CH₂-COOH, CH₃-COOH

27. The least basicity shows

1. diethylamine

2. methyl amine

3. Diethyl ether

4. diethylsulfide

5. ethanol

28. The less the Ka of the organic compound the

1. more is acidity

2. less is acidity

3. less is basicity

4. more stable the anion

5. more is electronegativity of atom in the acid centre

29.By increasing of atom polarization in acid center

1. the stability of anion decreases

2. the acidity of compound decreases

3. the basicity of compound increases

4. the acidity of compound increases

5. the delocalization of negative charge of atom decreases

30. The greatest acidity shows

1. ОН - acid

2. SH - acid

3. NH - acid

4. CH - acid

5. the compounds listed are not acids