0

Guest

Courses New

The bond length of B-F in BF4(-) is longer than the bond length of B-F in BF3---------explain

The bond length of B-F in BF4(-) is longer than the bond length of B-F in BF3---------explain

Grade:12

3 Answers

Adarsh poddar
21 Points
7 years ago
In BF3, the B-F "single bond" has some double bond character, not present in BF4-. If you write a conventional valence bond structure for BF3, with single B-F bonds, there are only six electrons on B and a vacant p-orbital at right angles to the plane of the molecule. So you can give B an octet by writing a formal negative charge on B, a formal positive charge on one of the F, and a double bond between B and that F. In molecular orbital terms, you can say that the appropriate p orbitals on F overlap this vacant orbital on B.
Adarsh poddar
21 Points
7 years ago
In BF3, the B-F "single bond" has some double bond character, not present in BF4-. If you write a conventional valence bond structure for BF3, with single B-F bonds, there are only six electrons on B and a vacant p-orbital at right angles to the plane of the molecule. So you can give B an octet by writing a formal negative charge on B, a formal positive charge on one of the F, and a double bond between B and that F.
Pratibha Kumari
13 Points
5 years ago
Bcz,in BF3 back bonding is present.if back bonding occur then bond order increases and bond lenght decreases.
 

Think You Can Provide A Better Answer ?

Other Related Questions on Physical Chemistry

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More