Saved Bookmarks
| 1. |
Draw the structure of BCl_(3).NH_(3) and AlCl_(3) (dimer). |
Answer» Solution :In `BCl_(2)` the CENTRAL B atom has six electrons in the valence shell. It is,therefore, an ELECTRON deficient molecule and needs twomore electrons to completeits octet. In otherwords, `BCl_(3)`actsas a Lewis acids. `NH_(3)`,on theother hand, has a lone pair of electronswhich it can donate EASILY. Therefore,`NH_(3)` acts as a Lewisbase. The Lewis acid `(BCl_(3))`and theLewisbase `(NH_(3))`combinetogetherto form an adduct as SHOWN below :  In `AlCl_(3)`, Al has sixelectronsin the velence shell. Therefore, it is an electrondeficient moleculeand needs two more electrons tocompleteits octet. In otherwords, `AlCl_(3)` acts as a Lewis acid. Chlorine, on the other hand,has THREE lone pairs of electrons. Therefore, to completeits octet, the central Al atom of one moleculeaccepts a lone pair of electronsfrom Cl atom of theother moleculeforming adimericstructureas shownabove. 
|
|