14D_s07_finalA - Chemistry 14D Spring 2007 Final Exam Part...

Chemistry 14D Spring 2007 Final Exam Part A Page 1
For any question on any portion of this exam worth three or more points, you have two choices:
answer the question as written or you may write and circle the phrase “one point”. If you write “one
point” you will receive one point (and only one point) of credit for the question. “One point”
overrides anything you have written for that question, regardless of its accuracy.
Example: (10) Briefly explain everything about organic chemistry.
One point
Phosgene (Cl
2
C=O) was among the first chemical weapons, utilized widely during the protracted trench
warfare of World War I. Once inhaled, phosgene reacts with water (and other nucleophiles) in the lungs to
produce hydrochloric acid (aqueous HCl). Questions 1 - 4 refer to the reaction of phosgene with water.
Cl Cl
O
H
2
O
Cl OH
O
H
2
O
HO OH
O
Phosgene Chlorocarbonic acid Carbonic acid
1. (6) Write the mechanism for the formation of chlorocarbonic acid from phosgene.
2. (10) Which molecule reacts fastest with water (circle one):
phosgene chlorocarbonic acid reaction rates about equal
Explain your reasoning in twenty words or less .