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Q.

Given below are two statements one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms acid immediately below and above it in the series.
Reason R: The solubility of monocarboxylic acids in water decreases with increase in molar mass.
Choose the most appropriate option:
 

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a

Both A and R are true and R is the correct explanation of A

b

Both A and R are true and R is NOT the correct explanation of A

c

A is true but R is false

d

A is false but R is true

answer is B.

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Detailed Solution

The melting point of carboxylic acid has no trend. 
Water solubility of carboxylic acid decreases as we increase the molar mass, due to increase in hydrophobic part of the chain.
 

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