Proof for the following in the natural products is obtained by some reactions. GROUP I Natural Products GROUP II Reactions (P) Cholesterol-nature of ring (1) Treatment with {\HNO}_2 forms a nitroso compound (Q) Ephedrine-secondary amino group (2) Selenium dehydrogenation gives Diel's hydrocarbon (R) Morphine-secondary - {\OH} group (3) With {\CH}_3 {\I} in aqueous {\KHO} gives (-) codeine, which is not soluble in alkali; codeine can be oxidized with chromic acid to codeinone (S) Caffeine-nature of ring (4) Oxidation which potassium chlorate in hydrochloride acid gives diamethyl alloxan and methyl urea

Correct Answer is : P-2, Q-1, R-3, S-4

Graduate Pharmacy Aptitude Test (GPAT) 2008 Solved Paper

Question : 57 of 85

Marks: +1, -0

Proof for the following in the natural products is obtained by some reactions.

GROUP I Natural Products	GROUP II Reactions
(P) Cholesterol-nature of ring	(1) Treatment with HNO2 forms a nitroso compound
(Q) Ephedrine-secondary amino group	(2) Selenium dehydrogenation gives Diel's hydrocarbon
(R) Morphine-secondary −OH group	(3) With CH3I in aqueous KHO gives (-) codeine, which is not soluble in alkali; codeine can be oxidized with chromic acid to codeinone
(S) Caffeine-nature of ring	(4) Oxidation which potassium chlorate in hydrochloride acid gives diamethyl alloxan and methyl urea

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