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Two statements are given below: Statement I: The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms immediately below and above it in the series. Statement II: The solubility of monocarboxylic acids in water decreases with increase in molar mass. Choose the most appropriate option:

1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.

Correct answer: Both Statement I and Statement II are correct.

Solution

Statement I is accurate because even-numbered monocarboxylic acids have stronger intermolecular forces due to better packing, leading to higher melting points compared to their odd-numbered counterparts. Statement II is also correct, as the increased molar mass of monocarboxylic acids generally results in a decrease in solubility in water due to the larger hydrophobic hydrocarbon chain.

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