CBSE 2025, Set 2

Question

Write chemical equations of the following reactions:

(i) Phenol is treated with conc. HNO$_3$

(ii) Propene is treated with B$_2$H$_6$ followed by oxidation by H$_2$O$_2$/OH$^-$

(iii) Sodium t-butoxide is treated with CH$_3$Cl

Edvaya · Accepted Answer

The correct answer is Subjective. **(i) Phenol + Conc. HNO₃ (Nitration):** ![Phenol treated with conc. HNO₃ giving 2,4,6-trinitrophenol](https://www.edvaya.com/images/chemistry/cbse/2025/set2/q31b-phenol-conc-hno3-picric-acid.webp) $$	ext{C}_6	ext{H}_5	ext{OH} \xrightarrow{	ext{Conc. HNO}_3/	ext{H}_2	ext{SO}_4} \underbrace{	ext{2,4,6-(NO}_2)_3	ext{C}_6	ext{H}_2	ext{OH}}_{	ext{Picric acid (2,4,6-trinitrophenol)}}$$ **(ii) Propene + B₂H₆, then H₂O₂/OH⁻ (Hydroboration-oxidation):** $$3\,	ext{CH}_3	ext{CH=CH}_2 + (	ext{H–BH}_2)_2 ightarrow (	ext{CH}_3	ext{CH}_2	ext{CH}_2)_3	ext{B}$$ $$(	ext{CH}_3	ext{CH}_2	ext{CH}_2)_3	ext{B} \xrightarrow{	ext{H}_2	ext{O}_2/	ext{OH}^-} 3\,	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{OH (propan-1-ol)}$$ (Anti-Markovnikov addition — OH goes to less substituted carbon) **(iii) Sodium t-butoxide + CH₃Cl (Williamson synthesis):** $$(	ext{CH}_3)_3	ext{C–O}^-	ext{Na}^+ + 	ext{CH}_3	ext{Cl} ightarrow (	ext{CH}_3)_3	ext{C–O–CH}_3 + 	ext{NaCl}$$ Product: **Methyl tert-butyl ether (MTBE)**

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