MCQ
Phenol can be converted into salicylic acid by heating with
- A
$CO_2$ (under pressure) and alkali
- B$CCl_4$ and alkali
- C$CHCl_3$ and alkali followed by oxidation
- ✓All of the above
$CO_2$ (under pressure) and alkali
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$(a)\; C \;\;(b)\; O \;\;(c)\; F\;\; (d) \;Cl\;\; (e)\; Br$

$(A)$ $\left. Na _{4}\left[ Fe ( CN )_{5} NOS \right)\right]$
$(B)$ $Na _{4}\left[ FeO _{4}\right]$
$(C)$ $\left[ Fe _{2}( CO )_{9}\right]$
( $U$ : आंतरिक ऊर्जा (internal energy), $S$ : एंट्रॉपी (entropy), $p$ : दाब (pressure), $V$ : आयतन (volume), $R$ : गैस नियतांक (gas constant)
(दिया गयाः स्थिर आयतन पर गैस की मोलर ऊष्माधारिता (molar heat capacity at constant volume), $C_{V, m }$ का मान $\frac{5}{2} R$ है)