In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which α– hydrogen has been replaced by halogen. This reaction is known as :

(1) Etard reaction

(2) Hell -Volhard – Zelinsky reaction

(3) Wolff -Kishner reaction

(4) Rosenmund reaction

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane