Question

Among the following, the dissociation constant is highest for:

• A. $C_6{H}_{5}OH$
• B. ${CH}_{3}OH$
• C. ${CH}_{3}C\equiv CH$
• D. ${CH}_3{NH}_3^{+}{Cl}^{-}$

Answer 1

The correct option is D ${CH}_3{NH}_3^{+}{Cl}^{-}$

Among the following ${CH}_3{NH}_3^{+}{Cl}^{-}$ has a high dissociation constant as it is a strong base which dissolves completely in eqeous solution.

As ${CH}_3^{+}{NH}_3{Cl}^{-}$ has nitrogen atom which is less electronegative than oxygen, it easily loses an electron and gets ionised.

${CH}_3-C\equiv CH$ has a triple bond which is unsaturated but cannot forms ions easily in aqeous solutions making it less ionisable.

So, ${CH}_3^{+}{NH}_3{Cl}^{-}$ has more dissociation constant.