Vapours of acetic acid smell

In Activity 1.5, the text emphasizes that chemical substances can be identified by their 'characteristic odour' (e.g., the odour of burning sulphur for $SO_2$). Acetic acid ($CH_3COOH$) is the primary component of vinegar, and thus its vapours carry that same sharp, pungent smell. Option B is incorrect as sweet smells are characteristic of esters. Option C is incorrect because a suffocating smell like burning sulphur is characteristic of sulphur dioxide ($SO_2$), as noted in Eq. 1.19. Option D is incorrect because acetic acid is a volatile chemical with a distinct smell, unlike pure water.