Question

Which of the following compounds has the highest boiling point?

• A. \( \text{CH}_3(\text{CH}_2)_2\text{CH}_2\text{OH} \)
• B. \( \text{C}_2\text{H}_5\text{CH}(\text{CH}_3)_2 \)
• C. \( \text{CH}_3(\text{CH}_2)_2\text{CH}_2\text{NH}_2 \)
• D. \( (\text{C}_2\text{H}_5)_2\text{NH} \)

Hint:

Hydrogen bonding significantly increases the boiling point of a compound, making alcohols have higher boiling points than similar alkanes and amines.

Answer 1

The Correct Option is A

Step 1: Understanding boiling points.
Boiling points of organic compounds are influenced by factors such as molecular weight, polarity, and hydrogen bonding. Alcohols generally have higher boiling points than alkanes and amines due to hydrogen bonding.

Step 2: Analyzing the options.
(A) \( \text{CH}_3(\text{CH}_2)_2\text{CH_2\text{OH} \):} This is an alcohol, and alcohols have higher boiling points due to hydrogen bonding.
(B) \( \text{C}_2\text{H}_5\text{CH}(\text{CH}_3)_2 \): This is an alkane, which typically has a lower boiling point than alcohols.
(C) \( \text{CH}_3(\text{CH}_2)_2\text{CH_2\text{NH}_2 \):} This is an amine, and while amines have higher boiling points than alkanes, they typically have lower boiling points than alcohols.
(D) \( (\text{C}_2\text{H}_5)_2\text{NH \):} This is also an amine with a lower boiling point than the alcohol.

Step 3: Conclusion.
The correct answer is (A) \( \text{CH}_3(\text{CH}_2)_2\text{CH_2\text{OH} \)}, as alcohols generally have the highest boiling points due to hydrogen bonding.