This is because butterfly caterpillars are host specific. Plant-wise, the caterpillars of some butterfly species like asters, black-eyed Susan, clover, lupines, milkweed, sedum or violets. Aspen, birch, cherry, hackberry, oak or willow trees make caterpillars of other butterfly species equally happy.
each Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.ach Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.
Report Abuse. Its a nice answer except that AlCl3 is non-polar. Al only has three valence electrons and thus is a planar molecule with all the dipole resulting from the Cl canceling out. you know that AlCl3 is polar as all its electrons are used in binding and it has three bonds (one to each Cl).eport Abuse. AlCl3 is not polar or non polar, it is ionic. Aluminum is a metal, chlorine is a non metal which is the only kind of bond it can have. Ionic compounds have a net charge of zero, but it is not non polar.