Which of the following substances conducts electricity when dissolved in water?

• A. C_6H_{12}O_6
• B. NaCl
• C. CH_3OH
• D. CCl_4

Answer: (B)

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 which substances are electrolytes (produce ions in water) and which are nonelectrolytes (do not produce ions).
3. Recognize that \(\mathrm{NaCl}\) is an ionic compound that dissociates into \(\mathrm{Na^+}\) and \(\mathrm{Cl^-}\) ions in water, allowing it to conduct electricity.
4. Note that \(\mathrm{C_6H_{12}O_6}\) (glucose) and \(\mathrm{CH_3OH}\) (methanol) are molecular compounds that dissolve as neutral molecules and do not produce ions, so they do not conduct electricity.
5. Understand that \(\mathrm{CCl_4}\) (carbon tetrachloride) is a nonpolar molecular compound that is not soluble in water and does not produce ions, so it also does not conduct electricity.