Which compound below forms an electrolyte solution when dissolved in water?

• A. CH_3OH (methanol)
• B. C_6H_{12}O_6 (glucose)
• C. CCl_4
• D. NaCl

Answer: (D)

Verified step by step guidance

1. Understand what an electrolyte is: an electrolyte is a substance that dissociates into ions when dissolved in water, allowing the solution to conduct electricity.
2. Examine each compound's nature and behavior in water: CH_3OH (methanol) and C_6H_{12}O_6 (glucose) are molecular compounds that dissolve but do not dissociate into ions; they form nonelectrolyte solutions.
3. Consider CCl_4 (carbon tetrachloride), which is a nonpolar molecular compound and is not soluble in water, so it does not form an electrolyte solution.
4. Recognize that NaCl (sodium chloride) is an ionic compound that dissociates completely into Na^{+} and Cl^{-} ions in water, making the solution conductive and thus an electrolyte.
5. Conclude that among the given options, only NaCl forms an electrolyte solution because it produces free ions in aqueous solution.