Question 72

A group 13 element X reacts with chlorine gas to produce compound $$\text{XCl}_3$$. $$\text{XCl}_3$$ is electron deficient and easily reacts with $$\text{NH}_3$$ to form $$\text{Cl}_3\text{X} \leftarrow \text{NH}_3$$ adduct. However, $$\text{XCl}_3$$ does not undergo dimerization. X is

Solution

All group 13 trichlorides are Lewis acids that form adducts with $$\text{NH}_3$$. $$\text{AlCl}_3$$ and $$\text{GaCl}_3$$ dimerize through chlorine bridges, but boron is too small to hold four large Cl atoms around it, and $$p\pi$$-$$p\pi$$ back bonding partly relieves its electron deficiency. So $$\text{BCl}_3$$ stays monomeric and X is B.

Was this solution helpful?

Get AI Help

50,000+ JEE Students Trusted Our Score Calculator

Predict your JEE Main percentile, rank & performance in seconds

Ask AI