1.34g of an organic compound (having some methoxy groups) with the molecular weight 134 gives 7.05 g of AgI precipitate in the Zeisel’s method of estimation of methoxy groups. The weight percentage of methoxy group(s) in the organic compound is
(G.A.W. of Ag is 108g, I is 127g)

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answer is 69.2.

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Detailed Solution

Zeisel method: Organic compound is heated with excess HI, forming alcohol and $C H_{3} I . R O C H_{3} + H I \to R O H + C H_{3} I$ . The iodomethane is distilled off and led into an alcoholic solution of $A g N O_{3}$ , where it precipitates AgI
No. of moles of organic compound $= \frac{1.34}{134} = 0.01 m o l e$
No. of moles of AgI precipitated $= \frac{7.05}{235} = 0.03$
Number of methoxy groups per org.molecule = number of moles of AgI precipitated per one mole of organic compound =3
W% of methoxy in the organic compound $= \frac{93}{134} \times 100 = 69.4$ .