(a) when one H atom of C3H8 is replaced by a Cl atom.
(b) when one H atom of C3H8 is replaced by OH group.
(c) when one H atom of C3H8 is replaced by a CHO group.
(d) when one H atom of C3H8 is replaced by a COOH group.
(e) when two H atoms joined to the middle carbon atom of C3H8 are replaced by one O atom.
(b) Propanol, CH3-CH2-CH2-OH
(c) Butanal, CH3-CH2-CH2-CHO
(d) Butanoic acid, CH3-CH2-CH2-COOH
(e) Propanone, CH3-CO-CH3