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  1. Variable valency in general, is exhibited by
  2. The total number of isomeric alcohols with the molecular formula C₄H₉OH is
  3. The reaction of phenol with alkaline chloroform gives salicylaldehyde, it is
  4. Which of the following is obtained when sodium phenoxide is heated with ethyl
  5. Chemical A is used for water softening to remove temporary hardness.