Write the IUPAC name of the following compound.
`CH_(3)CH_(2)=underset(CH)underset(||)C-overset(CH_(2)CH_(2)C(CH_(3))_(3))overset(|)C-CH=CH_(2)`

Explanation

(a) The compound can be written as
`{:(" "CH_(2)-CH_(3)),(" |"),(CH_(2)= C- CH- CH= CH_(2)),(" |"),(" "CH_(2)),(" |"),(" "CH_(2)),(" |"),(" "H_(3)C-C-CH_(3)),(" |"),(" "CH_(3)):}`
Parent chain contains five carbon atoms including both the double bonds. Ethyl group is present at second carbon atom and a butyl group with two methyl groups is present at third carbon atom.
The IUPAC name is:
(b) The compound can be written as
`CH_(3)-CH_(2) - underset(underset(CH_(3))(|))(CH) - CH_(2) - underset(underset(underset(underset(CH_(3))(|))(CH-OH))(|))(CH)-CH_(2)-CHO`
Parent chain has seven carbon atoms. There are two subtituents. Hydroxyl group is present on the ethyl group. The substituent is named as 1.-hydroxy ethyl, The IUPAC name is : `3-(1.-Hydroxyethyl)-5-methylheptanal