Reaction sequence forms ethyl propyl ether, a flavouring agent Steps:

• Propanoic acid (CH₃CH₂COOH) reduced by excess LiAlH₄ forms propan-1-ol (CH₃CH₂CH₂OH) via hydride addition and workup.
• Propan-1-ol mixed with ethanol (CH₃CH₂OH) and conc. H₂SO₄ undergoes acid-catalyzed dehydration to ethyl propyl ether (CH₃CH₂CH₂OCH₂CH₃). Why C is correct:
• Ethyl propyl ether serves as a flavouring agent in foods and perfumes due to its fruity aroma, as defined in food chemistry applications. Why the others are wrong:
• A: Ethers like this are not major fuels; oxygenates like MTBE are specific additives, not general ethers.
• B: While diethyl ether is a solvent, ethyl propyl ether's primary commercial role is flavouring, not extraction or dissolution.
• D: Insufficient information on option D, but it does not match the product's uses.

Final answer: C