The correct options are
A bromopentane CH3−CH2−CH2−CH2−CH2−Br
C 2-bromopentane CH3−CH2−CH−CH2−CH3↓Br
The possible structural isomers of bromopentane can be shown as:
(i) CH3−CH2−CH2−CH2−CH2−Br; 1-bromopentane.
(ii) CH3−CH2−CH2−CH(Br)−CH3; 2-bromopentane.
(iii) CH3−CH2−CH(Br)−CH2−CH3; 3-bromopentane.