Ethylene oxide is an intermediate in the manufacture of ethylene glycol (antifreeze) and polyester polymers. More than 4 million tons are produced annually in the United States. The molecule has a three-member ring of two C atoms and an O atom.

(a) What are the bond angles in the ring? Comment on the relation between the bond angles expected based on hybridization and the bond angles expected for a three-member ring.
(b) Is the molecule polar? Based on the electrostatic potential map shown below, where do the negative and positive charges lie in the molecule?

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:0 H C-H C-H H Ethylene oxide