ANSWERS
1
2C
3 Aldehydes will undergo oxidation reactions as they are easy to oxidise, (1)
but ketones won't react in oxidation reactions as they are resistant to oxidation. (1)
4 Aldehydes react with Tollen's reagent to form a silvery precipitate, (1)
however ketones won't react with Tollen's reagent, therefore nothing is observed. (1)