When (R)-3-buten-2-ol is treated with a peroxy acid, two strereoisomeric epoxides are form...

When (R)-3-buten-2-ol is treated with a peroxy acid, two strereoisomeric epoxides are formed in a 60:40 ratio. The minor stereoisomer has the structure shown.

(a) What is the structure of the major isomer?

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(b) What is the relationship between the two epoxides? Are they enantiomers or diastereomers?

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(c) What four stereoisomeric products are formed when racemic 3-buten-3-ol is epoxidized under the same conditions? How much of each stereoisomer is formed?