How many monochloro isomers are possible for CH₃CH₂CH₂CH₂CH₃ ?
Pentane ( CH₃CH₂CH₂CH₂CH₃ ) has three unique carbon positions for Cl substitution (C₁/C₅, C₂/C₄, C₃), yielding 3 isomers.
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Classification and Nomenclature and Isomerism of Haloalkanes