Question on Photochemical Chlorination

A saturated hydrocarbon (A) burns in oxygen to give carbon dioxide and water. Approximately twice as much CO2 as H2O (by weight) is produced by this combustion, the actual factor being 2.03. Photochemical chlorination of the (A) by 2.0 equivalents of chlorine gives a mixture of mono-, di- and trichloro compounds, along with small amounts of higher chlorination products. Only one monochloro isomer is formed, but there are two dichloro isomers and three trichloro isomers produced in the reaction. What is the name of (A)?

Question on Hardness of Water

In an experiment, 100 mL of tap water is taken from 1000 mL of its stock solution and boiled till the volume becomes 3/4th the original volume. The precipitate dissolved in 1 mL of 0.1M HCl solution. In another experiment, 100mL of same sample of tap water is boiled with 29 mL of 0.1N Na2CO3 solution, the resulting solution cooled and insoluble material removed by filtration. The filtrate required 10 mL of 0.1 NHCl for complete neutralization. What will be the permanent hardness of water (in terms of ppm of CaCO3)?

Question on Equivalent Weights

Monosodium salt of oxalic acid is titrated with NaOH solution. In a second titration it is titrated with KMnO4 solution. What will the ratio of equivalent weights of monosodiumoxalate in both the titration be?

Answer:

The equivalent weight of oxalic acid in the titration with NaOH is equal to its molecular weight and in the titration with KMnO4 it is equal to half of its molecular weight. So, the ratio of equivalent weights of monosodium oxalate in both the titrations will be 2.

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