Purification and Characterisation of Organic Compounds

Complete combustion of X g of an organic compound gave 0.25 g of $\mathrm{CO_2}$ and 0.12 g of $\mathrm{H_2O}$. If the % of carbon is 25% and of hydrogen is 4.89%, then X = ______ $\times10^{-3}$ g. (Nearest integer) (Molar mass of C, H and O are 12, 1 and 16 g mol$^{-1}$ respectively.)

2.0 g of a bromo hydrocarbon (X) was subjected to Carius analysis, gave 3.36 g of AgBr. The percentage of carbon in the compound (X) is 26.7%. Total number of carbon atoms in the empirical formula for compound (X) is ______. (Given molar mass in g mol$^{-1}$ H:1, C:12, Br:80, Ag:108)

In sulphur estimation, $2.0\times10^{-3}$ mol of an organic compound (X) (molar mass 76 g mol$^{-1}$) gave 0.4813 g of barium sulphate (molar mass 233 g mol$^{-1}$). The percentage of sulphur in the compound (X) is ______ $\times10^{-1}$ % (Nearest integer)

In an estimation of sulphur by Carius method 0.2 g of the substance gave 0.6 g of $\mathrm{BaSO_4}$. The percentage of sulphur in the substance is _______%. (Given molar mass in g $\mathrm{mol^{-1}}$ S : 32, $\mathrm{BaSO_4}$ : 231)

Match List - I with List - II. List - I (Purification technique): A. Simple distillation; B. Fractional distillation; C. Steam distillation; D. Distillation under reduced pressure. List - II (Used to separate): I. Steam volatile compound; II. Two liquids with large difference in boiling points; III. Liquid decomposing at its boiling point; IV. Two liquids with close boiling points. Choose the correct answer from the options given below :

$R_f$ value for 2-methylpropene in a solvent system (Ethyl acetate + ether) is 0.42. 2-methylpropene is treated with dilute $\mathrm{H_2SO_4}$ to give major organic product (X). $R_f$ value for (X) in the same solvent system under identical condition will be:

Given below are two statements : Statement I: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation. Statement II: The vapours rising up in the fractionating column become richer in high boiling component of the mixture. In the light of the above statements, choose the correct answer from the options given below :

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is ______%. (Given: molar mass in g mol$^{-1}$ of Ag: 108, Cl: 35.5)

Given below are two statements : Statement (I) : Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test. Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test. In the light of the above statements, choose the correct answer from the options given below :