Chemistry - CHEMICAL BONDING Question with Solution | TestHub
All the boron trihalides except BI₃ may be prepared by direct reaction between the elements. Boron trihalides consist of trigonal–planar BX₃ molecules. Unlike the halides of the other elements in the group, they are monomeric in the gas, liquid, and solid states. BF₃ and BCl₃ are gases, BBr₃ is a volatile liquid, and BI₃ is a solid. Boron trihalides are Lewis acids because they form Lewis complexes with suitable bases.
However, boron chlorides, bromides, and iodides are susceptible to protolysis by mild proton sources such as water, alcohols, and even amines. For example, BCl₃ undergoes rapid hydrolysis:
It is supposed that the first step in the above reaction is the formation of the complex , which then eliminates HCl and reacts further with water.
Which is correct about the hydrolysis of ?
Options:
Answer:
Solution:
BF₃ does not undergo complete hydrolysis because strong back bonding stabilizes it and forms the intermediate H⁺[BF₃OH]⁻ instead of full hydrolysis.
