When the halohydrin is treated with NaH an alkoxide is formed as the product . it does the intermolecular SN² reaction to displace halide and form cyclic ether called epoxide.
The halohydrin is treated with NaH , the product is formed the alkoxide and the alkoxide ion does the SN² reaction . the halide is displaced and form the cyclic ether . this cyclic ether is the 3 membered ring and called as the epoxide. this is an intermolecular Williamson ether synthesis.
Thus, when the halohydrin reacts with NaH , the product is formed called as epoxide and then the product form is trans stereochemistry.
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