Explain why the S−H bond in ethanethiol is longer than the O−H bond in ethanol if the S and O in the mentioned compounds are both sp³ hybridized.

• A. Sulfur has a larger atomic radius than oxygen, leading the S−H bond in ethanethiol to be longer compared to the O−H bond in ethanol.
• B. Oxygen has a higher ionization energy than sulfur, leading the O−H bond in ethanol to be shorter than the S−H bond in ethanethiol.
• C. Sulfur has a higher electron affinity than oxygen, leading the S−H bond in ethanethiol to be stronger than the O−H bond in ethanol.
• D. Oxygen has a larger electronegativity than sulfur, leading the O−H bond in ethanol to be more polar than the S−H bond in ethanethiol.

Answer: (A)