Question

Which of the following in soluble in water?
A)CS2 B)C2H5OH C)CCl4 D)CHCl3.
Please explain.

Answer 1

Answer on Question #44846 – Chemistry – Inorganic Chemistry

Question

Which of the following is soluble in water?

A) CS₂

B) C₂H₅OH

C) CCl₄

D) CHCl₃.

Please explain.

Answer

Correct option is B) C₂H₅OH

Solvents can be broadly classified into two categories: polar and non-polar. Generally, the dielectric constant (ε) of the solvent provides a rough measure of a solvent's polarity (the greater the dielectric constant the greater the polarity). Water is polar solvent (ε = 80.4).

There is a general rule: polar substances are soluble in polar solvents and insoluble in non-polar solvents, and non-polar substances are soluble in non-polar solvents and insoluble in polar solvents. The only polar substance among given four options is ethanol (DC = 24.3), that is why ethanol is soluble in water. CS₂ (ε = 2.6), CCl₄ (ε = 2.2) and CHCl₃ (ε = 4.8) are non-polar and that is why they are insoluble in water.

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