Number of compounds from the following which | vedclass

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(D) The compounds are analyzed for their solubility in cold $NaHCO_3$,cold $NaOH$,and hot $NaOH$:$1$. $p$-Toluic acid: Dissolves in $NaHCO_3$ and $NaO

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$3$

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(D) The compounds are analyzed for their solubility in cold $NaHCO_3$,cold $NaOH$,and hot $NaOH$:$1$. $p$-Toluic acid: Dissolves in $NaHCO_3$ and $NaOH$.$2$. Methyl benzoate: Does not dissolve in cold $NaHCO_3$ or $NaOH$,but undergoes hydrolysis in hot $NaOH$ to form benzoic acid and methanol,thus dissolving.$3$. $p$-Cresyl acetate: Does not dissolve in cold $NaHCO_3$ or $NaOH$,but undergoes hydrolysis in hot $NaOH$ to form $p$-cresol and acetic acid,thus dissolving.$4$. $o$-Hydroxyacetophenone: Dissolves in $NaOH$ (phenolic group) but not $NaHCO_3$.$5$. $3$-Hydroxy$-5-$methylbenzaldehyde: Dissolves in $NaOH$ (phenolic group) but not $NaHCO_3$.$6$. $1$-Isopropyl$-3-$methoxybenzene: Does not dissolve in any of these.$7$. Phenyl acetate: Does not dissolve in cold $NaHCO_3$ or $NaOH$,but undergoes hydrolysis in hot $NaOH$ to form phenol and acetic acid,thus dissolving.Therefore,the compounds that do not dissolve in cold $NaHCO_3$ and $NaOH$ but dissolve in hot $NaOH$ are $2$,$3$,and $7$. The total count is $3$.

Number of compounds from the following which will not dissolve in cold $NaHCO_3$ and $NaOH$ solutions but will dissolve in hot $NaOH$ solution is $........$.

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