CBSE 2023 · Region 2 · Set 1 · Q26 · 3 marks
(a)Write the mechanism of the following reaction: $\displaystyle 2+1$ \[2 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \xrightarrow[413 \mathrm{~K}]{\mathrm{H}^{+}} \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{CH}_{3}+\mathrm{H}_{2} \mathrm{O} \](ii)Why ortho-nitrophenol is steam volatile while para-nitrophenol is not?What happens when(i)Anisole is treated with $\displaystyle \mathrm{CH}_{3} \mathrm{C} l /$ anhydrous $\displaystyle \mathrm{A} l \mathrm{Cl}_{3}$?(ii)Phenol is oxidised with $\displaystyle \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} / \mathrm{H}^{+}$?(iii)$\displaystyle \left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{OH}$ is heated with $\displaystyle \mathrm{Cu} / 573 \mathrm{~K}$? Write chemical equation in support of your answer.
(a)
Write the mechanism of the following reaction: $\displaystyle 2+1$ \[2 \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \xrightarrow[413 \mathrm{~K}]{\mathrm{H}^{+}} \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{CH}_{3}+\mathrm{H}_{2} \mathrm{O} \]
(ii)
Why ortho-nitrophenol is steam volatile while para-nitrophenol is not?
What happens when
(i)
Anisole is treated with $\displaystyle \mathrm{CH}_{3} \mathrm{C} l /$ anhydrous $\displaystyle \mathrm{A} l \mathrm{Cl}_{3}$?
(ii)
Phenol is oxidised with $\displaystyle \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} / \mathrm{H}^{+}$?
(iii)
$\displaystyle \left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{OH}$ is heated with $\displaystyle \mathrm{Cu} / 573 \mathrm{~K}$? Write chemical equation in support of your answer.
Marking-scheme solution
(i)
(ii)
Due to intramolecular H-bonding in o-nitrophenol while p-nitrophenol has intermolecular H-bonding.
(i)
(ii)
(iii)
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CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.