Passage III
When t-butyl chloride [(CH3)3CCI] is dissolved in an acetone-H2O solution, it reacts with H2O completely to form t-butyl alcohol [(CH3)3COH]:
(CH3)3CCI + H2O 
(CH3)3COH + H+ + CI-
Acetone is less polar than H2O. Thus, increasing the concentration of acetone in H2O decreases the polarity of the reaction solution.
Figures 1 and 2 show how the electrical conductivity of each of 5 acetone-H2O solutions varied over time after 1 mg of (CH3)3CCI was dissolved in 100 ml of each solution. The conductivity (which increased as the solution's ion concentration increased) stopped increasing when the reaction had run to completion (indicated by the point labeled "RC").
Figures adapted from Peter Keusch, "Kinetics: Hydrolysis of Tertiary Butyl Halides - First Order Reaction." ©2000 by Universitàt Regensburg.
12. Based on Figure 2, if a 45% acetone solution had been tested, the reaction would most likely have reached completion at a time:
Your Answer is
Correct Answer is H
Explanation
45% is between 40% and 50%, so the completion time is also between the two, that is, between about 1300-1800, and the H option is the closest to this range