From Primary Alcohols And Aldehydes

In the preparation of aldehydes from primary alcohols, adehydes formed must be distilled as soon as they are formed. Why ?

Statement-1: Formation of cyclic acetal is entropically favourable. Statemen-2: PCC converts primary alcohol into aldehydes. Statement-3: Aliphatic alcohols are practically insoluble in aqueous NaOH.

Which of the following reagents can be used to oxidise primary alcohols to aldehydes ?

The most suitable reagent for the conversoin of primary alcohol into aldehyde with the same number of carbon is