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JEE Main · 2022 · 24 Jun 2022 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

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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 acid 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. (A)Both Statement I and Statement II are correct.✓ Correct
  2. (B)Both Statement I and Statement II are incorrect.
  3. (C)Statement I is correct but Statement II is incorrect.
  4. (D)Statement I is incorrect but Statement II is correct.

Answer: (A)

Solution

Statement I is correct: Monocarboxylic acids with even number of carbon atoms have better packing efficiency in the crystal lattice, leading to higher melting points compared to acids with odd carbon atoms immediately adjacent in the series. Statement II is also correct: As molar mass increases, the hydrophobic alkyl chain becomes larger, decreasing the solubility in water. Both statements are correct.

JEE Main · 2022 · 24 Jun 2022 · Shift 1 · Single correct option

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