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JEE Main 202224 JuneMorning Shift
Exam
JEE Main
Year
2022
Date
24 June
Shift
Morning Shift
Subject
Chemistry
Chapter
Carboxylic Acid Derivatives

JEE Main 2022 · 24 June · Morning Shift · Chemistry · Carboxylic Acid Derivatives

Two statements are given belwo : Statement I : The melting point of...

Two statements are given belwo :

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 :

Options

  1. ABoth Statement I and Statement II are correct.
  2. BBoth Statement I and Statement II are incorrect.
  3. CStatement I is correct but Statement II is incorrect.
  4. DStatement I is incorrect but Statement II is correct.

Correct answer

D. Statement I is incorrect but Statement II is correct.

Step-by-step solution

The melting point of carboxylic acid has no trend as we can observe from the following data of metling point.

Methanoic acid =8°C= 8 ° C, Ethanoic acid =17°C= 17 ° C, Propanoic acid =2°C= 2 ° C, Butanoic acid =−6°C= - 6 ° C, Pentonoic acid =−35°C= - 35 ° C, Hexonic acid =−20°C= - 20 ° C, Heptanoic acid =−8°C= - 8 ° C, Octanoic acid =17°C= 17 ° C acid. Water solubility of carboxylic acid decreases as we increase the molar mass & hence hydrophobic part of the chain.

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