Answer
Hydrogen bonding is no longer possible after the replacement.
Work Step by Step
Replacement with the CH$_3$ group removes ethylene glycol's ability to hydrogen bond. The IMFs are lowered dramatically, lowering the BP.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 11 - Liquids and Intermolecular Forces - Exercises - Page 474: 11.27a
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