JEE Main 2022 · 24 Jun · Shift 1 · Chemistry Q74

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ChemistrySingle correct+4 / -1Question 74 of 90

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 :

Both Statement I and Statement II are correct.

Both Statement I and Statement II are incorrect.

Statement I is correct but Statement II is incorrect.

Statement I is incorrect but Statement II is correct.

Answer and worked solution

Official answer: A

Statement I is correct: even-carbon acids pack better in the crystal, so their melting points are higher than those of the odd-carbon acids on either side (the zig-zag trend).

Statement II is correct: the growing hydrocarbon chain makes the acids less soluble in water as the molar mass rises.

(A)

Topics:Carboxylic acids

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JEE Main 2022 · 24 Jun · Shift 1, Chemistry question 74