Review Questions

1 . Consider    the following   reaction:

H 2     (g) +   F 2     (g) →   2   HF  (g)

Is  the H—F bond    more    or  less    polar   than    an  H—H bond?

2 . Arrange the following   compounds   in  terms   of  increasing  polarity:

HCN,    NaCl,   Cl 2

3 .  (A) Which  has a   greater C-C bond    distance,   C 2 H 4     or  C 2 H 2?

(B) Which   has a   greater C-C bond    energy?

4 . Which   represents  the proper  Lewis   structure   of:

(A) CHCl 3

I.

II.