Question

8. Arrange the binary tetrahalides of Si (SiX4 , X=F, CI, Br, 1) in terms of increasing Lewis acidity and provide an explanation of the trend. Please do the same for the SnX4 analogs.

Answer 1

dewis acidi au the → al SiXy compone Aave vacant 3d-mbital which can Sixy & Soxy where x=f, d, BH, I. acidi au the Species which can accept a Male Elections and tom bond with the donating species. The greater the tendency andinty to accept to accent @pave the sounger ! is the lewis acid SEXY Compound act as Newi acidi became (x = halogens) the ollicon atom have vacan accept the point of co. ► Now consider the Halogens - Flourne => F is a a small ion small ion and hence it cannot donate and show ene to Si . So, I tendency to tone pai e accept ee pare. w large and can donat i pe pail to the Vacant 3d-orbital / Si Similarly, Brand I aloo alonate Lone paire to SC show quatul tendency to donate e" to si and hence Sily u lenet acidic because it mbitau have e. So, it further cany accort lene pair o e- . Order of Lewis acid strength is SiI4 < Sibry & Sicly < SFY moot audic react acidic → Asimilas Explanation for Snxy. Compound aloo. F does not donate de paie bsn Hence Sofy has mette acidic strength Soly < Sn Bry < Snely < Shfy. Lewis and thength SHLOOL meat audio least acidic