Select the compound having all equivalent bond lengths :

Which of the following has all equal bond lengths?

A compound having a bond angle 180° is

The compound shown is planar and all the C-C bond lengths are the same. What is the bonding of sp^(2) -hybridized boron?

All these molecules have sp^(3) hybridization, select the molecule in which all the bond do not have same percentage (s) character: