Three organic compounds A,B and C were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The `R_(f)` value of the most poar compound is _____`times 10^(-2)`

Three compounds A, B, and C are isomers of the formula C_5H_8 . All of them decolourise bromine in C Cl_4 and give a positive test with Baeyer's reagent. All three compounds dissolve in cone. H_2SO_4 . Compound A gives a white precipitate with ammoniacal silver nitrate, whereas compounds B and C do not react with it. On hydrogenation, in the presence of platinum catalyst, both compounds A and B yield n-pentane, whereas compound C gives a product of formula C_5H_(10) . On oxidation with hot acidified KMnO_4 , B gave acetic acid and CH_3CH_2COOH . Identify compounds A, B, and C.

10 " mL of " a gaseous organic compound containing C, H and O only was mixed with 100 " mL of " O_(2) and exploded under condition which allowed the H_(2)O formed to condense. The volume of the gas after explosion was 90 mL. On treatment with KOH solution, a further contraction of 20 mL in volume was observed. The vapour density of the compound is 23. All volume measurements were made under the same condition. Q.The molecular formula of the compound is

10 " mL of " a gaseous organic compound containing C, H and O only was mixed with 100 " mL of " O_(2) and exploded under condition which allowed the H_(2)O formed to condense. The volume of the gas after explosion was 90 mL. On treatment with KOH solution, a further contraction of 20 mL in volume was observed. The vapour density of the compound is 23. All volume measurements were made under the same condition. Q.The volume of CO_(2) is

10 " mL of " a gaseous organic compound containing C, H and O only was mixed with 100 " mL of " O_(2) and exploded under condition which allowed the H_(2)O formed to condense. The volume of the gas after explosion was 90 mL. On treatment with KOH solution, a further contraction of 20 mL in volume was observed. The vapour density of the compound is 23. All volume measurements were made under the same condition. Q.The volume of unreacted O_(2) is