Consider the transformation below and fill in the blanks with the reagents in the correct order. The product is racemic. The starting reacant is but-1-yne and the final product is pentane-2,3-diol. Only five of the following reagents will be used to get to the final product. The reagents are: EtCl. MeOTf. Na(degree),NH3. H2, Pd/C. mCPBA. NaHSO3, H2O. H2, Lindlars. OsO4. O3. DMS. NaNH2. NaOH.

For this problem I wrote out the steps and got these reagents:

1. NaNH2 2. EtCl 3. H2, Pd/C 4. OsO4 5. NaHSO3, H2O

However i got a 4.2/5 points so I am wondering where I might of gone wrong. Thank you!!