Question

Which one of the following pairs will form an ideal solution?

Options

• chloroform and acetone

• ethanol and acetone

• n-hexane and n-heptane

• phenol and aniline

Answer 1

n-hexane and n-heptane

Explanation:

Since the intermolecular interactions (solute solvent) between n-hexane and n-heptane after solution formation are comparable to their intermolecular attractions (solute-solute, solvent solvent) prior to component mixing, they will form an ideal solution across the whole concentration range.

\[\begin{array}{cc}
\phantom{..............................}\ce{Br}\phantom{........................}\ce{OH}\\
\phantom{............................}|\phantom{..........................}|\\
\ce{\underset{Propene}{CH3 - CH = CH2} + HBr -> \underset{2-Bromopropane}{CH3 - CH - CH3} ->[aq. KOH] \underset{2-Propanol}{CH3 - CH - CH3}}
\end{array}\]