Question:
The compound X can be separated from spent-lye in soap industry by using distillation under reduced pressure. What is X?
The compound X can be separated from spent-lye in soap industry by using distillation under reduced pressure. What is X?
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Glycerol is an important by-product of soap industry and is widely used in pharmaceuticals, cosmetics and explosives.
Updated On: Jun 18, 2026
- \(CH_3CH_2OH\)
- \(CH_2(OH)CH_2(OH)\)
- \(HOCH_2CH(OH)CH_2OH\)
- \(HOCH_2(CHOH)_2CH_2OH\)
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The Correct Option is C
Solution and Explanation
Concept:
During soap manufacture, glycerol remains dissolved in the aqueous layer known as spent-lye. It is recovered by distillation under reduced pressure.
Step 1: Recall the by-product of soap manufacture.
Soap is produced by saponification of fats and oils. \[ \text{Fat/Oil} + NaOH \rightarrow \text{Soap} + \text{Glycerol} \]
Step 2: Identify glycerol.
The structure of glycerol is \[ HOCH_2CH(OH)CH_2OH \] It is also called propane-1,2,3-triol.
Step 3: Select the correct option.
Among the given compounds, \[ HOCH_2CH(OH)CH_2OH \] represents glycerol. \[ \boxed{\text{Option (C)}} \]
Step 1: Recall the by-product of soap manufacture.
Soap is produced by saponification of fats and oils. \[ \text{Fat/Oil} + NaOH \rightarrow \text{Soap} + \text{Glycerol} \]
Step 2: Identify glycerol.
The structure of glycerol is \[ HOCH_2CH(OH)CH_2OH \] It is also called propane-1,2,3-triol.
Step 3: Select the correct option.
Among the given compounds, \[ HOCH_2CH(OH)CH_2OH \] represents glycerol. \[ \boxed{\text{Option (C)}} \]
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