JEE Main · 2020 · 06 Sep 2020 · Shift 2 · Hydrocarbons

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The increasing order of the boiling points of the major products A, B and C of the following reactions will be:
(a)
(b)
(c)

(A)B < C < A✓ Correct
(B)C < A < B
(C)A < B < C
(D)A < C < B

Answer: (A)

Solution

The three reactions give isomeric products, so their boiling points are settled by how the molecular shape affects intermolecular attraction rather than by any difference in molar mass. Weighing up the branching and the surface available for van der Waals contact across the three structures, the boiling points rise in the order

B < C < A

, with product A boiling highest.

JEE Main · 2020 · 06 Sep 2020 · Shift 2 · Single correct option

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