which-sequence-of-reactions-would-you-use-to-protect-an-aldehyde-group-in-a-mult

Question

Which sequence of reactions would you use to protect an aldehyde group in a multi-step synthesis and then regenerate it at the end?

Accepted Answer

Form an acetal, carry out the desired reactions, then hydrolyze the acetal.

Answer

Convert the aldehyde to a ketone, perform reactions, then convert back to an aldehyde.

Answer

Oxidize the aldehyde to a carboxylic acid, perform reactions, then reduce back to an aldehyde.

Answer

Dehydrate the aldehyde, perform reactions, then rehydrate to form the aldehyde.