Question

Three centered bond is present in:
A. $N{H_3}$
B. ${B_2}{H_6}$
C. $BC{l_3}$
D. $AlC{l_3}$

Answer 1

It is an electron deficient chemical bond where 3 atoms share 2 electrons. Later the combination of three atomic orbitals produce three molecular orbitals.Diborane is used highly in rocket propellants, working as a reducing agent, also as a rubber vulcanizer, as a catalyst for hydrocarbon polymerization, as a flame-speed accelerator, and as a doping agent. It is thereafter also used in electronics to impart the electrical properties in pure crystals.

Complete answer:
A three-centered two-electron bond is actually an electron deficient chemical bond where three atoms are able to share two electrons. This combination of three atomic orbitals produce three molecular orbitals which are bonding, non-bonding, and antibonding.
The two electrons in this actually go into the bonding orbital, which results in a net bonding effect and then constitutes a chemical bond among all 3 atoms. In several common bonds of this type, the bonding orbital gets shifted towards two of the three atoms rather than being spread equally among all three of them. The simplest example of a three centered bond is the ​${B_2}{H_6}$.

Hence, Correct Option is B) ${B_2}{H_6}$

Additional Information: ${B_2}{H_6}$, known as diborane, is actually the chemical compound consisting of boron and hydrogen along with the formula ${B_2}{H_6}$. It is a colourless, pyrophoric gas having a repulsively sweet odour.

Note:
By checking the hint and the following options, questions can be easily answered. ${B_2}{H_6}$ has three centered bonds and it is present in group 13. The structure or figure of a Diborane molecule consists of 4 hydrogen atoms and that of 2 boron atoms which are coming on the same plane. In among these planes, there are said to be 2 dividing atoms of hydrogen. The boron atom is actually known to be $s{p^3}$ hybridized and contains 4 hybrid orbitals.