A group 13 element 'X' reacts with chlorine gas to produce a compound XCl 3 . XCl 3 is electron deficient and easily reacts with NH 3 to form Cl 3 X arrow NH 3 adduct; however, XCl 3 does not dimerise. X is

Question

A group 13 element 'X' reacts with chlorine gas to produce a compound XCl 3 . XCl 3 is electron deficient and easily reacts with NH 3 to form Cl 3 X arrow NH 3 adduct; however, XCl 3 does not dimerise. X is (A) B (B) Al (C) Ga (D) In

Tardigrade Admin · Accepted Answer

The shape of the BCl 3 molecule is a planar triangle with bond angles of 120° . This is predicted by VSEPR theory as the most stable shape for three outer electron pairs round B. The valence bond theory also predicts a planar triangle with hybridisation of one s and two p orbitals used for bonding. However, the B atom only has six electrons in its outer shell and this is termed electron deficient. The empty 2 pz orbital on the boron atom in BCl 3 can also be filled by a lone pair of electrons from donor molecule such as NH 3 . BCl 3 does not dimerise.

Q. A group 13 element 'X' reacts with chlorine gas to produce a compound XCl3​.XCl3​ is electron deficient and easily reacts with NH3​ to form Cl3​X←NH3​ adduct; however, XCl3​ does not dimerise. X is

B

Al

Ga

In

Q. A group 13 element 'X' reacts with chlorine gas to produce a compound $XC l_{3} . XC l_{3}$ is electron deficient and easily reacts with $N H_{3}$ to form $C l_{3} X \leftarrow N H_{3}$ adduct; however, $XC l_{3}$ does not dimerise. $X$ is