Tokens’ reagent

Hi Describe and explain the different results obtained when the compound named in part b ii is warmed with Tokens reagent in a test tube and then the same test is performed on butanone. 

Since it does not reduce Tokens or Fehltng reagent, (A) must be a ketone. (A) responds to iodoform test. Therefore, it should be a methyl ketone. The molecular formula of (A) Indicates high degree of unsaturation, yet it does not decolourise bromine water or Baeyer s reagent. This indicates the presence of unsaturation due to an aromatic ring. 

A naturally occurring optically active pentose (C6H10O5) reduces Token s reagent and forms a tetraethanoate with ethanoic anhydride. It gives an optically inactive phenylosazone. Write all the possible structures for this pentose that are in accord with each of the experimental observations. 

Arseno-phosphorus compounds have been obtained by treating m-amino-p-hydroxyphenylarsinic acid with phosphoryl chloride in the presence of aqueous sodium hydroxide and subsequently reducing the mixture with sodium hydrosulphite. The compounds are soluble in dilute sodium carbonate and in hydrochloric acid, their alkaline solutions reducing Fehlmg s solution and Nessler s and Token s reagents. ... 

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