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  • Two isomers (A) and (B) with Molar mass 184 g/mol and elemental composition <img alt="\mathrm{\text { C, } 52.2 \%; \mathrm{H}, 4.9 \%}" src="/latex-image/?%5Cmathrm%7B%5Ctext%20%7B%20C%2C%20%

Two isomers (A) and (B) with Molar mass 184 g/mol and elemental composition \mathrm{\text { C, } 52.2 \%; \mathrm{H}, 4.9 \%} and \mathrm{\operatorname{Br}, 42.9 \%} gave benzoic acid and p-bromobenzoic acid, respectively on oxidation with \mathrm{KMnO}_{4}. Isomer 'A' is optically active and gives a pale yellow precipitate when warmed with alcoholic \mathrm{AgNO}_{3}. Isomer 'A' and 'B' are, respectively

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

Find molecular formula

Elements C H Br
Mass(g) 52.2 4.9 42.9
Number of moles of atoms \frac{52.2}{12} \frac{4.9}{1} \frac{42.9}{79.9}
Ratio of moles 4.35 4.9 0.54
Simplest ratio of moles \frac{4.35}{0.54}=8 \frac{4.9}{0.54}=9 \frac{0.54}{0.54}=1

\text { Empirical formula }=\mathrm{C}_{8} \mathrm{H_9} \mathrm{Br}

\text { Given, molar mass }=184\: \mathrm{~gmol^{-1}}

\text { So, Molecular formula }=\mathrm{C}_{8} \mathrm{H_9} \mathrm{Br}

Hence correct answer is option 3

Posted by

shivangi.shekhar

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