Which gas liberated when 2 bromopropane heated with alcoholic potash?
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2-bromopropane is heated under reflux with a concentrated solution of sodium or potassium hydroxide in ethanol. Heating under reflux involves heating with a condenser placed vertically in the flask to avoid loss of volatile liquids. Propene is formed and, because this is a gas, it passes through the condenser and can be collected.
Everything else present (including anything formed in the alternative substitution reaction) will be trapped in the flask.
Everything else present (including anything formed in the alternative substitution reaction) will be trapped in the flask.
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