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 $Cl _{3} X \leftarrow NH _{3}$ adduct; however, $XCl _{3}$ does not dimerise. $X$ is
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 $Cl _{3} X \leftarrow NH _{3}$ adduct; however, $XCl _{3}$ does not dimerise. $X$ is
Updated On: Feb 6, 2026
- B
- Al
- Ga
- In
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The Correct Option is A
Solution and Explanation
The shape of the $BCl _{3}$ molecule is a planar triangle with bond angles of $120^{\circ} .$ 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 $2 p_{z}$ 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.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family