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Un compus organic A cu formula bruta CnH2nO contine 69,76% carbon. Determinati numarul de izomeri corespunzatori formulei moleculare a compusului A, care pot aditiona acid cianhidric in raport molar 1:1. Raspunsuri : A. 3; B. 4; C. 7; D. 8 E. 9

Răspuns :

%C=mC/M*100
69.76=12n/14n+16*100==>69.76(14n+16)=1200n==>976.64n+1116.16=1200n==>n=223.36n=1116.16==>n=4

F.m = C4H8O

NE=1

CH2=CH-CH(OH)-CH3
CH3-CH=C(OH)-CH3