Question

Why are some organic compounds purified by distillation at low pressure?
A) they have high boiling points
B) they have low boiling points
C) they are highly volatile
D) They dissociate before reaching their boiling points

Answer 1

Organic compounds are any chemical molecules that include carbon-hydrogen bonds in chemistry. Millions of organic compounds have been identified as a result of carbon's propensity to catenate (form chains with other carbon atoms). Organic chemistry is the science that studies the characteristics, reactions, and syntheses of organic substances.

Complete answer:
Vacuum distillation is the process of distilling at decreased pressure to purify chemicals that are difficult to distil at ambient pressures or simply to save time and energy. Compounds are separated using this method depending on their boiling temperatures. When the boiling point of the desired compound is difficult to reach or will cause the chemical to disintegrate, this approach is utilised. Reduced pressure lowers a compound's boiling point. The Clausius–Clapeyron relation may be used to compute the decrease in boiling point using a temperature-pressure nomograph.
Distilling under ambient pressure is common for compounds having a boiling point less than $150 ^oC$ . Short-path distillation equipment is often used for materials with high boiling points. Organic Synthesis has a lot of examples of this approach.
The temperature at which a liquid's vapour pressure equals the external pressure causes molecules to dissociate and create new molecules is known as the boiling point. To keep the molecule from dissociating, the external pressure is decreased, lowering the boiling point and preventing dissociation.

Note:
Vacuum distillation can enhance a separation by preventing product degradation or polymer formation due to lower tower bottom temperatures caused by reduced pressure.
Reduced mean residence time reduces product degradation or polymer formation, especially in columns that employ packing rather than trays.
Capacity, yield, and purity are all increasing.