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.
Best Answer: NCl3 has a net dipole moment so it is polar...however not nearly so much as OF2, or NF3..The difference in the EN between N and Cl is not great but the lone electron pair on N gives the molecule electronic asymmetry.eport Abuse. NCL3,polar molecule,because have lone pair.Formed in trigonal pyramidal shape.Polar bond.A covalent bond is polar if the covalent bond in the molecules is polar bond and the molecules is not symmetrical and have a nett dipole moment. Kobe B Â· 7 years ago. Thumbs up.