A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at ${}^{}$ $63{}^{?}\mathrm{C}$ while the other boils at ${60}^{?}\mathrm{C}$ ${}^{}$ . What is the best way to separate the two liquids and which one will be distilled out first?

<p>Isohexane and 3-Methylpentane having same molecular formula. Isohexane boil at <span contenteditable="false"> <math> <msup> <mrow> <mrow> <mn>60</mn> </mrow> </mrow> <mrow> <mrow> <mo>? </mo> </mrow> </mrow> </msup> <mi mathvariant="normal">C</mi> </math> </span> and 3-Methyul pentane boils at <span contenteditable="false"> <math> <msup> <mrow> <mrow> <mn>63</mn> </mrow> </mrow> <mrow> <mrow> <mo>? </mo> </mrow> </mrow> </msup> <mi mathvariant="normal">C</mi> </math> </span>. Both having low boiling point difference so fractional distillation is useful for separation and isohexane having low boiling point so comes out first.</p>

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