Question

1. when forming molecular orbitals from atomic orbitals, what is the order of increasing C-H bond strength for the following.

I. sp^3

II. sp^2

III. sp

a) II<I<III

b) III < II < I

c) I < II < III

d) III < I < II

3. How many different isomers are there for a compound having the molecular formula C3H6O?

a) 5

b) 6

c) 7

d) 4

3. What 2 things will change between two resonance structures?

a) the placement of atoms and non-bonded electrons.

b) the position of mulstiple bonds and single bonds.

c) the placement of atoms and single bonds.

d) the position of multiple bonds and non-bonded electrons.

4. Arrange the following bonds in decreasing order of ionic character, putting the most ionic first.

I. C-C

II. C-N

III. C-O

IV. Na-O

a) IV> III> II >I

b) IV > II > III > I

c) IV > II > I > III

d) I > II > III > IV

5. Which of the following molecules has nonpolar covalent bonds?

a) N2

b) NO

c) CHCl3

d) HCl

6. In which of the following ions does carbon have a formal charge?

a) CH3OH

b) NaCH3

c) CH3CO2-

d) none of the above

7. Which of the following compounds is the strongest acid?

a) CH3Cl

b) CH3NH2

c) BrCH2OH

d) CH3OH

8. Which of the following compounds is the weakest acid?

a) HCl

b) H2S

c) SiH4

d) PH3

9. Rank the following compounds in order of decreasing acidity, putting the most acidic first.

I. CH3CH2OH

II. CH3CH2NH2

III. ClCH2CH2OH

10. Rank the following compounds in order of increasing acidity, putting the least acidic first.

I. CH3COOH

II. ClCH3COOH

III. CH3CH2OH

IV. ClCH2CH2OH

11. Identify the Lewis base in the following reaction.

Br2 ---(FeBr3)---> FeBr4(-) + Br (+)

12. Identify the Lewis acid in the following reaction.

Br2----(FeBr3)--> FeBr4 (-) + Br (+)

13. What is the conjugate acid and conjugate base in the following reaction?

HCl + H2O ---> Cl- + H3O+

Answer 1

1) C    I < II < III

2) 7 isomers

3) d) the position of multiple bonds and non-bonded electrons

4) a) IV> III> II >I ( electro neagtivity difference is more => ionic character is more)

5) N₂ (It has identical atoms with the same electronegativity, so the bonding electrons are shared equally, so it is non polar)

6) d) none of the above

7) c) BrCH2OH

8) c) SiH4

9) ClCH2CH2OH > CH3CH2OH > CH3CH2NH2

10) CH3CH2OH < ClCH2CH2OH < CH3COOH < ClCH3COOH

11) Br2

12) FeBr3

13) conjugate acid = H₃O⁺, conjugate base = Cl^-