Question:
Identify the organic compound having highest boiling point from following.
Identify the organic compound having highest boiling point from following.
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For similar molar masses, the compound with the strongest hydrogen bonding boils highest. Carboxylic acids form dimers.
Updated On: Nov 12, 2026
- \(\text{n-C}_{4}\text{H}_{9}\text{NH}_{2}\)
- \((\text{C}_{2}\text{H}_{5})_{2}\text{NH}\)
- \(\text{C}_{4}\text{H}_{9}\text{OH}\)
- \(\text{C}_{2}\text{H}_{5}\text{-COOH}\)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
All four compounds have molar masses close to 73-74 g/mol, so the strength of intermolecular hydrogen bonding decides the boiling point.
Step 2: Compare hydrogen bonding
Amines have N-H bonds that form weak H-bonds. Butanol has O-H bonds and forms stronger H-bonds, so it boils near 118 degrees C.
Step 3: Carboxylic acid
Propanoic acid forms strongly hydrogen-bonded dimers, which raises its boiling point to about 141 degrees C, the highest of the four.
Final Answer:
Propanoic acid has the highest boiling point. \[ \boxed{\text{(D) }\text{C}_{2}\text{H}_{5}\text{-COOH}} \]
All four compounds have molar masses close to 73-74 g/mol, so the strength of intermolecular hydrogen bonding decides the boiling point.
Step 2: Compare hydrogen bonding
Amines have N-H bonds that form weak H-bonds. Butanol has O-H bonds and forms stronger H-bonds, so it boils near 118 degrees C.
Step 3: Carboxylic acid
Propanoic acid forms strongly hydrogen-bonded dimers, which raises its boiling point to about 141 degrees C, the highest of the four.
Final Answer:
Propanoic acid has the highest boiling point. \[ \boxed{\text{(D) }\text{C}_{2}\text{H}_{5}\text{-COOH}} \]
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