Which of the following compounds will conduct electricity when dissolved in water?

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

Answer: (C)

Verified step by step guidance

1. Understand that electrical conductivity in aqueous solutions depends on the presence of ions that can move freely and carry charge.
2. Identify whether each compound dissociates into ions when dissolved in water: ionic compounds like NaCl dissociate into Na⁺ and Cl⁻ ions, which conduct electricity.
3. Recognize that molecular compounds such as CH_3OH (methanol) and C_6H_{12}O_6 (glucose) dissolve as neutral molecules and do not produce ions, so they do not conduct electricity.
4. Note that CCl_4 is a nonpolar molecular compound that does not dissolve well in water and does not ionize, so it will not conduct electricity.
5. Conclude that among the given compounds, only NaCl will conduct electricity in aqueous solution because it produces free ions.