Question

How many number of maximum atoms lie in same plane in $F_{2}B-C\equiv C-B{F}_2$ molecule?

Answer 1

All $8$ atoms are in one plane because two carbon atoms are in one plane due to having $sp$ hybridization and boron is $s{p}^2$ hybridized which is trigonal planar, which means carbon atom, boron and two $F$ atoms are in one plane and one carbon atom is planar with other carbon atom and hence, that makes the molecules planar.