Question

Bottle A contains a solid bottle B contains a liquid and bottle c contains a gas. the labels indicate the compounds all have the same number of carbon atoms, one being an aldehyde, one a carboxyic acid and one an alkyne. suggest the identity of the contents

Answer 1

Since the temperature of the surroundings is not mentioned, it is reasonable to assume STP conditions (0^oC and 1 atm).

Bottle A - acetic acid CH₃COOH (Carboxylic acid; solid; melting point is about 17^oC);

Bottle B - ethanal CH₃CHO (Aldehyde, liquid; melting point about -124^oC, boiling point about 20^oC);

Bottle C - ethyne C₂H₂ (Alkyne; gas; boiling point about -84^oC).