MCQ
The only $o, p-$ directing group which is deactivating in nature is
- A$ - N{H_2}$
- B$ - OH$
- ✓$ - X$ (halogens)
- D$ - R$ (alkyl groups)
o. p. directing groups are as follow :
$ - C{H_3},{C_2}{H_5}( - R), - N{H_2}, - OH$, halogens $(Cl,\,Br,\,I)$.
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Reason : Addition of non-volatile solute into solvent results into depression of freezing point of the solvent.
$2 A ( g ) \rightarrow A _{2}( g )$
at $298\, K , \Delta U^ \ominus,=-20\, kJ\, mol ^{-1}, \Delta S \odot=-30\, J$$K ^{-1}\, mol ^{-1},$ then the $\Delta G ^{\ominus}$ will be........$J$