Ketones R and R' cannot be H they should be alkyl or aryl group.
Ketones
R and R' cannot be H they should be alkyl or aryl group.
Carboxylic acids
Amines R and R' cannot be H they should be alkyl or aryl group.
Amines
Ethers R and R' cannot be H they should be alkyl or aryl group.
Ethers