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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 2 · Q26
(a) Write the chemical equation for Williamson's synthesis. (b) Give a method to separate o -nitrophenol and p -nitrophenol. Explain the principle…
(a)
Write the chemical equation for Williamson's synthesis.
(b)
Give a method to separate $\displaystyle o$-nitrophenol and $\displaystyle p$-nitrophenol. Explain the principle involved.
Marking-scheme solution
(a)
(b)
Steam distillation
o- nitrophenol has intra-molecular H-bonding and p- nitrophenol has inter-molecular H-bonding/
o- nitrophenol is steam volatile due to intra-molecular H-bonding/p-Nitrophenol is less volatile
due to inter-molecular H-bonding resulting in association of its molecules
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.