Not to ding Miessler and Tarr, I love the book. But i'm finding more typos than usual in the 4th ed. Someone suggested I create a forum post to log them to be helpful. Here are the ones I can think of right now:
problem 12.21 (page 482): R. L. Rheingold?? should be A. L. Rheingold.
problem 6.27 (page 218): NH3 CH3NH2(CH3)2 NH(CH3)3 N; certainly supposed to be NH3 CH3NH2 (CH3)2NH (CH3)3N
Add others in the comments!