Since formic acid and methylcyclohexane have the same boiling point which is 101°C, the two solutions are collected together when distilled.
Distillation is a separation method that depends on difference in boiling point between the components of a mixture.
If he two components of the mixture have different boiling points, they can be collected separately, the one that has the lower boiling point is collected first followed by the one that has the higher boiling point.
In this case formic acid and methylcyclohexane have the same boiling point hence the two solutions are collected together and separation in not achieved.
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