Although alcohol V gives a single alkene W when treated with POCI, and pyridine, three isomeric alkenes (X-Z) are formed on dehydration with H,SO4. Draw a stepwise mechanism for each reaction and explain why the difference occurs. он do.do.de POCI, pyridine V w H2SO4

Draw the structure of the product from the following: 1-Octyne + BH3 --> A A + H₂O₂/NaOH --> B Draw the structures of A and B

Draw the products of each elimination reaction.

Draw the product formed when pentanal (CH3 CH₂ CH₂ CH₂ CHO) is treated with each reagent. With some reagents, no reaction occurs. a. NaBH4, CH3OH b. [1] LiAiH4: [2] H₂O c. H₂, Pd-C d. PCC e. Na₂Cr₂O7, H₂SO4, H₂O f. Ag₂O, NH4OH g. [1] CH3 MgBr; [2] H₂O h. [1] C6H5 Li: [2] H₂O i. [1] (CH3)2 CuLi; [2] H₂O J. [1] HC=CNa; [2] H₂O k. [1] CH 3 C=CLI; [2] H₂O 1. The product in (a), then TBDMS-CI, imidazole