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5 cards from this section. Quick, good the night before a test.
Why does ethanol have a much higher boiling point than propane, although their molar masses are almost the same?
Which of the two has an O–H bond?
Which is more soluble in water, ethanol or pentan-1-ol? Give a reason.
Compare the sizes of the alkyl groups.
Which of these compounds has the highest boiling point?
Look for hydrogen bonding and the least branching.
The main reason why lower alcohols dissolve in water is
Think about the –OH group.
Propan-1-ol (CH₃CH₂CH₂OH, molar mass 60), methoxyethane (CH₃OCH₂CH₃, molar mass 60) and butane (C₄H₁₀, molar mass 58) have similar molar masses. Arrange them in decreasing order of boiling point and justify the order.
Rank the strongest intermolecular force in each compound.
A student argues: "Methanol, ethanol and propanol all mix with water, so every alcohol must dissolve in water." Use hexan-1-ol and 2-methylpropan-2-ol to correct this argument.
Compare the polar and non-polar parts of each molecule.
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