A dibasic acid containing C, H and O was found to contain C $$=$$ $$26.7$$% and H $$=$$ $$2.2$$%. The vapour density of its diethyl ester was found to be $$73$$. The molecular formula of the acid is

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Vapour density of diethylester $$=$$ $$73Molecular$$ weight of Diethylester $$=$$ $$146General$$ Formula of an ester $$=$$ RCOOR'General Formula of an ethylester $$=$$ $$RCOOC2H5General$$ Formula of an carboxylic acid $$=$$ RCOOHDecrease in weight when an ester is ofConverted to Carboxylic acid $$=$$ $$RCOOC2H5$$ $$-$$ Weight of  $$C2H5$$ $$+$$ weight  of  $$H=$$ Wt of $$RCOOC2H5$$ $$-$$ $$29$$ $$+$$ $$1=$$ Wt of $$RCOOC2H5$$ $$-$$ $$28But$$ we have a diethyl ester of a dicarboxylic acidMolecular weight  of dicarboxylic acid $$=$$ (Molecular$$ weight  of diethyl $$ester) $$-$$ $$2(28)=$$ $$146$$ $$-$$ $$56=$$ $$90Given$$: E.F of dicarboxylic acid $$=$$ $$CHO2EFW$$ of dicarboxylic acid $$=$$ $$12$$ $$+$$ $$1$$ $$+$$ $$2(16)$$ $$=$$ $$45MFW$$ of dicarboxylic acid $$=$$ $$90MF$$ $$=$$ $$(EF)2MF$$ $$=$$ $$(CHO2)2MF$$ $$=$$ $$C2H2O4$$

A dibasic acid containing C, H and O was found to contain C = 26.7% and H = 2.2%. The vapour density of its diethyl ester was found to be 73. The molecular formula of the acid is

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