10. Provide the major organic product of the reactions below.
(i)
(ii)
(iii)
(iv)
(?)
$CH_3$
1. TsCl, pyridine
OH
2. NaOEt, ?
$CH_2CH_3$
1. BH$_3$/THF
2. HO, H$_2$O$_2$
3. PCC
1. BH$_3$/THF
2. HO, H$_2$O$_2$
3. H$_2$CrO$_4$
1. CH$_3$CO$_3$H
2. NaCN
HO
$CH_3$
PCC