Question

Explain why bcl3 is monomer but bh3 exists as b2h6

Answer 1

Hi Dude


BCl3 in monomeric state is less stable hence it dimerises to for the dimer B2H6 Which is mlre stable.

Answer 2

As $BH_3$has the ability to undergo dimeriztion, it forms $B_2H_6$.

Explanation:

• Boron trihalides such as $BCl_3$ cannot extend its coordination number.
• That is the number of group/ atoms bonded to central atom beyond four due to non-availability of d-orbitals.
• On the other hand, the boron hydrides such as $BH_3$ is formed due to indirect bonding.
• In both halide as well as hydride, boron is the central atom but in case of halide it is combining with chlorine and in case of hydride it is combining with hydrogen.
• In the former case, the size of hydrogen in $BH_3$ is small, and boron contains only six electrons. As a result of which it can dimerise into $B_2H_6$.
• On the other hand, in latter case of $BCl_3$, as the size of chlorine is very large and has formed due to covalent bonding, it cannot undergo dimerization.

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