What forces operate between ethyl group of ethyl alcohol and oxygen of water?

Explanation

The correct answer is dipole forces (Option D). Ethyl alcohol (ethanol) contains an ethyl group, which is a non-polar hydrocarbon part, while the hydroxyl group (-OH) is polar. Water is also a polar molecule, and the oxygen in water has a partial negative charge, creating a dipole. When ethyl alcohol is mixed with water, the polar nature of the hydroxyl group in ethanol allows it to interact with the polar water molecules through dipole-dipole interactions. Therefore, the forces operating between the ethyl group of ethyl alcohol and the oxygen of water are primarily dipole forces. Option A (H-bonding) is incorrect because while hydrogen bonding can occur between the hydroxyl group of ethanol and water, the question asks specifically about the ethyl group. Option B (repulsive forces) is incorrect as it does not accurately describe the attractive interaction that occurs. Option C (attractive forces) is too vague, as it does not specify the type of attractive forces involved, whereas 'dipole forces' provides the necessary specificity.