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Q.

Correctly matched items among the following is (are)

 

Column I

(Pairs of amino acids)

Column II

(distinguishing test)

IProline and HistidineNaNO2/Con.HCl
IISerine and GlycineCeric ammonium nitrate solution
IIITryptophan and TyrosineNeutral ferric chloride solution
IVLysine and Glutamic acidNaHCO3

 

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a

II only

b

II, III, IV only

c

I, II, III, IV

d

I, II, III only

answer is B.

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Detailed Solution

Proline does not have primary amino group while histidine has. With NaNO2/HCl, histidine gives effervescence of nitrogen.
Serine has an alcohol group and hence gives red colouration with ceric ammonium nitrate.
Tyrosine has phenolic group and hence would give characteristic colouration with FeCl3.
As both Lysine and glutamic acids both have acidic groups, they both would evolve CO2 with NaHCO3 and hence can’t be differentiated.
 

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