Question:
Write the IUPAC names of the following ketones and aldehydes. Wherever possible, give also common names.
(i) CH3CO(CH2)4CH3
(ii) CH3CH2CHBrCH2CH(CH3)CHO
(iii) CH3(CH2)5CHO
(iv) Ph-CH=CH-CHO
(v) 
(vi) PhCOPh
Solution:
(i) CH3CO(CH2)4CH3
IUPAC name: Heptan-2-one
Common name: Methyl n-propyl ketone
(ii) CH3CH2CHBrCH2CH(CH3)CHO
IUPAC name: 4-Bromo-2-methylhaxanal
Common name: (γ-Bromo-α-methyl-caproaldehyde)
(iii) CH3(CH2)5CHO
IUPAC name: Heptanal
(iv) Ph-CH=CH-CHO
IUPAC name: 3-phenylprop-2-enal
Common name: β-Pheynolacrolein
(v)
IUPAC name: Cyclopentanecarbaldehyde
(vi)PhCOPh
IUPAC name: Diphenylmethanone
Common name: Benzophenone