Which pair of liquids would you expect to be immiscible? 1. chcl3 and ccl4 2. ch3oh and h2o 3. c6h14 and h2o 4. c6h6 and c7h8 5. c8h18 and c10h22?

Answer is Option-3:
                               C₆H₁₄ (Hexane) and H₂O are immiscible.

Explanation:
                   Hexane is a chain of six carbon atoms attached to each other in straight chain and hydrogen atoms. All the bonds in this compound are non-polar. Hexane molecules interact with each other through London Dispersion Forces.
                  While, Water molecules are polar in nature, due to electronegativity difference between Oxygen and Hydrogen atoms the Hydrogen atom is partially positive and Oxygen atom is partially negative. And water molecles interact with each other through hydrogen bonding.

 Result:
                As we know LIKE DISSOLVES LIKE, so both Hexane and water are different from each other, so when mixed together thay fail to develop interactions with each other, Hence immiscible in each other.

Not a  mixture of two common elements that can be separated by physical means.