On treating a compound... | Organic Chemistry JEE Main 2021

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JEE MAIN 2021

26-02-2021 S1

Question

On treating a compound with warm dil. $\mathrm{H}_2 \mathrm{SO}_4$, gas X is evolved which turns $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ paper acidified with dil. $\mathrm{H}_2 \mathrm{SO}_4$ to a green compound $\mathrm{Y} . \mathrm{X}$ and Y respectively are -

Select the correct option:

A

$\mathrm{X}=\mathrm{SO}_2, \mathrm{Y}=\mathrm{Cr}_2 \mathrm{O}_3$

B

$\mathrm{X}=\mathrm{SO}_3, \mathrm{Y}=\mathrm{Cr}_2 \mathrm{O}_3$

C

$\mathrm{X}=\mathrm{SO}_2, \mathrm{Y}=\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3$

D

$\mathrm{X}=\mathrm{SO}_3, \mathrm{Y}=\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & \mathrm{SO}_2+\text { dil } \mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \mathrm{SO}_3(\mathrm{~g}) \\ & \mathrm{SO}_3+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \xrightarrow[\mathrm{H}_2 \mathrm{SO}_4]{\text { dil }} \mathrm{SO}_3(\mathrm{~g})\end{aligned}$

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