Removing an electron from molecular oxygen, $O_2$, to form the dioxygenyl cation, ${O^{+}}_2$, causes what changes in the bond length and in the number of unpaired electrons?

          Bond length                            Number of unpaired electrons

1.  Increase                                       Increase

2.  Increase                                       Decrease

3.  Decrease                                      Increase

4.  Decrease                                      Decrease

How many carbon-carbon double bonds are present in linolenic acid, $\mathrm{\alpha }-{\mathrm{C}}_{17}{\mathrm{H}}_{29}\mathrm{COOH}$?

1.  1

2.  2

3.  3

4.  4

The formulae and boiling points of three compounds are given in this table.

The trend in boiling points is best attributed to variations in

1.  Covalent bonding

2.  Dipole forces

3.  Dispersion forces

4.  Hydrogen bonding

Three monosulfur fluorides are known : ${\mathrm{SF}}_2,<mspace\; width="1em"></mspace>{\mathrm{SF}}_4<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{SF}}_6$. Of these, polar species include

1.  $S{F}_2$ Only

2.  $S{F}_4$ Only

3.  $S{F}_2$ and $S{F}_4$ Only

4.  $S{F}_2$, $S{F}_4$ and $S{F}_6$

Which ionic compound has the largest lattice energy?

1.  LiF

2.  BeO

3.  KBr

4.  CaS

The boiling points of ${\mathrm{CH}}_3{\mathrm{COCH}}_3,<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COC}}_2{\mathrm{H}}_5<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COC}}_3{\mathrm{H}}_7$ are $56°\mathrm{C},<mspace\; width="1em"></mspace>80°\mathrm{C},<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>102°\mathrm{C}$, respectively. This increase is best attributed to an increase in which of the following?

l.  Dipole-dipole interactions.

ll.  Dispersion forces.

lll.  Hydrogen bonding.

1.  l only

2.   I and ll 

3.  lll only

4.  ll and lll only

The lattice energy (energy required to separate the ions in an ionic solid) of MgO is much larger than that of LiF.

What contributes the most to this difference?

1.  $M{g}^{2+}$is a smaller ion than $L{i}^{+}$and $O^{2-}$ is a smaller ion than $F^{-}$

2.  F is more electronegative than O, and Li is more electropositive than Mg

3.  MgO contains doubly charged ions, while LiF contains singly charged ions

4.  MgO contains more electrons than LiF

Allene has the structure ${\mathrm{H}}_2\mathrm{C}<mspace\; width="1em"></mspace>=\mathrm{C}={\mathrm{CH}}_2<mspace\; width="1em"></mspace>$. What is the best description of the geometry of allene?

  Geometry at central carbon                    Position of hydrogen atoms

1.  Linear                                                  All in the same plane

2.  Linear                                                  In two perpendicular planes

3.  Bent                                                    All in the same plane

4.  Bent                                                    In two perpendicular planes

Which property or properties of metals can be accounted for by the electron sea model?

l.  Electrical conductivity

ll. Malleability

1.  l only

2.  ll only

3.  Both l and ll

4.  Neither l nor ll

What is the principal energetic factor in the lack of miscibility between $C_6{H}_{14}\left(l\right)$ and $H_{2}O\left(l\right)$?

1.  The strength of intermolecular forces of attraction between $C_6{H}_{14}\left(l\right)$ molecules

2.  The strength of intermolecular forces of attraction between $H_{2}O\left(l\right)$ molecules

3.  The differences between the molecular weights of the molecules

4.  The difference in electronegativity between carbon and hydrogen