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(D) The dissociation constant $(K_a)$ is a measure of the acidity of a substance.$1$. $CH_3NH_3^+Cl^-$ is a salt of a weak base $(CH_3NH_2)$ and a str

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$CH_3NH_3^+Cl^-$

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(D) The dissociation constant $(K_a)$ is a measure of the acidity of a substance.$1$. $CH_3NH_3^+Cl^-$ is a salt of a weak base $(CH_3NH_2)$ and a strong acid $(HCl)$,making it acidic.$2$. $C_6H_5OH$ (Phenol) has a $pK_a$ of approximately $10$.$3$. $C_6H_5CH_2OH$ (Benzyl alcohol) is very weakly acidic $(pK_a \approx 15-16)$.$4$. $CH_3C \equiv CH$ (Propyne) is very weakly acidic $(pK_a \approx 25)$.Comparing these,the conjugate acid of the weak base $CH_3NH_2$,which is $CH_3NH_3^+$,is significantly more acidic than the others. Therefore,$CH_3NH_3^+Cl^-$ has the highest dissociation constant.

Among the following,the dissociation constant $(K_a)$ is highest for:

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