Question

Back bonding is possible in which of the following compounds?

• A. $R_{3}SiOH$
• B. $P{F}_3$
• C. $B{F}_3$
• D. None of these

Answer 1

Answer: (A), (B), (C)

The correct options are
A

$R_{3}SiOH$

B

$P{F}_3$

C

$B{F}_3$

Back bonding: Transfer of lone pair from filled shell of an atom to the unfilled shell of the adjacent bonded atom. In general the donor atoms are the second period elements.

$R_{3}SiOH$: 2pπ—3dπ back-bonding between Silicon & Oxygen

$P{F}_3$: F has extra electrons and P has empty d orbitals, backbonding takes place.

$B{F}_3$: F has extra electrons and B has empty p orbitals, backbonding takes place.