Question

Number of halides that undergo partial hydrolysis-
BF3,CaF2, NF3, SiF4, SbC13, SF6, CH4,
BiCl3​

Answer 1

• $BF_{3}$ , $SiF_{4}$ , $SbCl_{3}$ , $BiCl_{3}$ undergo partial hydrolysis.

1. $BF_{3}$ undergoes partial hydrolysis due to the formation of adduct.

      $BF_{3} + H_{2}O$ ⇒ $BF_{3}.H_{2}O$

    2. $CaF_{2}$ is very sparingly soluble in water due to their lattice energy that's

    why it does not undergoes hydrolysis.

   3. $NF_{3}$  does not undergo hydrolysis at room temperature but it undergoes

    complete hydrolysis at high temperature.

   4. $SiF_{4}$ undergoes partial hydrolysis to form $H_{4}SiO_{4} + H_{2}SiF_{6}$

 

    5. $SbCl_{3} and BiCl_{3}$ undergoes partial hydrolysis because of increase in ionic  

     character and forms SbOCl and BiOCl.

    6. $SF_{6} and CH_{4}$ are inert because of their structure that's why they do not            

     undergo hydrolysis.

    So only four halides will undergo partial hydrolysis.