<prompt> Hypochloremia, hypokalemia and alkalosis are seen in:Congenital hypertrophic pyloric stenosisHirschsprungs disease.Esophageal atresiaJejunal atresia  <response>: Ans. is a i.e. Congenital hypertrophic pyloric stenosis Biochemical abnormality in congenital hypertrophic pyloric stenosis is a regular feature of AIIMS and AI examinations it has been repeated several times.The biochemical abnormality seen are:HypokalemiaHypochloremiaAlkalosis andParadoxical aciduriaThis topic has been discussed in detail earlier. 