NEET
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- NEET
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- Chemistry
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- Carboxylic Acid Derivatives
NEET · Chemistry · Carboxylic Acid Derivatives
Given below are two statements: Statement-I : The higher acids are...
Given below are two statements:
Statement-I : The higher acids are wax like solids and are practically odourless due to their low volatility.
Statement-II : Carboxylic acids upto nine carbon atoms are higher boiling point liquids than carbonyl compounds and even alcohols of comparable molecular masses.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth statement I and II are correct.
- BBoth statement I and II are incorrect.
- CStatement I is correct but statement II is incorrect
- DStatement I is incorrect but statement II is correct.
Correct answer
A. Both statement I and II are correct.
Step-by-step solution
Statement-I:
"The higher acids are wax like solids and are practically odourless due to their low volatility."
- True
- Reason: Higher carboxylic acids ((\mathrm{C}>10)) have large molar mass and strong van der Waals forces (\rightarrow) low volatility (\rightarrow) wax-like solids (\rightarrow) almost odourless.
Statement-II:
"Carboxylic acids up to nine carbon atoms are higher boiling point liquids than carbonyl compounds and even alcohols of comparable molecular masses."
- True
- Reason: Carboxylic acids form dimers via strong intermolecular hydrogen bonding, which greatly increases boiling points (even more than alcohols, aldehydes, and ketones of similar size).