Answer :

(a)


The sodium ion present in the soap react with the magnesium and calcium ions present in the hard water to form scum and therefore is not effective in the hard water whereas in the case of the detergent no scum formation takes place.


(b)



The nature of O-H bond in alcohol is polar and therefore , it easily loses hydrogen ion on coming in contact with the metal.


(c)



(d) Ethanal or Acetaldehyde


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