Question

When preparing 1-bromobutane from 1-butanol and HBr, why

mustit be washed with H2O, cold NaOH and NaCl?

Answer 1

Answer has been given below

Step-by-step explanation:

• During reaction of 1-butanol and HBr, some unreacted amount of HBr might present in reaction mixture. Hence cold NaOH is used to neutralize unreacted HBr.
• Washing with
  `H_(2)O` is done to remove the salt produced during neutralization i.e. NaBr from organic layer of 1-bromobutane.
• NaCl is added to remove water from organic layer. Because NaCl is more soluble in water than organic layer.