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In the following reaction sequence. the correct structure(s) of X is (are) X O Et , PBr ) 1 HCONMe , NaN ) 3 CO Me , NaI ) 2 2 3 2 3 2 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ → ⎯ Me enantiomerically pure N 3

1. M e OH
2. M e OH
3. Me OH
4. M e OH

Correct answer: M e OH

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