The IUPAC name of the compound (CH3)2 CH CH2CH2Cl is
1-Chloro-3-methyl butane
Long chain=4 carbom atoms
Wood root =but
primary suffix=ane
(saturated alkane)
Secondary prefix=2-chloro,3-methyl
Alphabetically,1-chloro,3-methyl.Numbering of chain is according to the lowest 'locant' set.
(d) 1-Chloro-3-methyl butane