Question

You are given an organic compound having the molecular formula C₃H₈. Give the name and formula of the compound formed:

(a) when one H atom of C₃H₈ is replaced by a Cl atom.
(b) when one H atom of C₃H₈ is replaced by a 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.

Answer 1

(a) When one H atom of C₃H₈ is replaced by a Cl atom, chloropropane is formed. It has the molecular formula CH₃-CH₂-CH₂-Cl.

(b) When one H atom of C₃H₈ is replaced by a OH group, propanol is formed. It has the molecular formula CH₃-CH₂-CH₂-OH.

(c) When one H atom of C₃H₈ is replaced by a CHO group, butanal is formed. It has the molecular formula CH₃-CH₂-CH₂-CHO.

(d) When one H atom of C₃H₈ is replaced by a COOH group, butanoic acid is formed. It has the molecular formula CH₃-CH₂-CH₂-COOH.

(e) When two H atoms, joined to the middle carbon atom of C₃H₈, are replaced by one O atom, propanone is formed. It has the molecular formula CH₃-CO-CH₃.