question_answer

\[P{{I}_{3}}\] upon hydrolysis give

A)  monobasic acid and dibasic acid

B)  monobasic and tribasic acid

C)  monobasic acid and a salt

D)  dibasic acid and tribasic acid

Correct Answer: A

Solution :

                 \[P{{I}_{3}}\] on hydrolysis gives, phosphorus acid and hydroiodic acid. \[P{{I}_{3}}+3{{H}_{2}}O\xrightarrow{{}}\underset{dibasic}{\mathop{{{H}_{3}}P{{O}_{3}}}}\,+\,\,\,\underset{monobasic}{\mathop{3HI}}\,\] \[{{H}_{3}}P{{O}_{3}}\] is a dibasic acid. The structure of \[{{H}_{3}}P{{O}_{3}}\] is as                 In \[{{H}_{3}}P{{O}_{3}}\] the two hydrogen atom are ionisable and one hydrogen atom is non-ionisable. Hence, it is a dibasic acid. While in HI one hydrogen atom is ionisable. So, it is a monobasic acid.