If all the following liquids are at the same temperature, then the liquid having the least vapor pressure will be:
  1. Butane (C₄H₁₀)
  2. Pentane (C₅H₁₂)
  3. Hexane (C₆H₁₄)
  4. Heptane (C₇H₁₄)
Explanation

Among the listed liquids, heptane (C₇H₁₄) has the greatest molecular weight

Thus the strongest intermolecular forces, lead to the lowest vapor pressure at the same temperature

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