For the first order thermal decomposition reaction, following data were obtained:

Calculate the rate constant.

(Given: log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

An organic compound ‘X’ having molecular formula C₄H₈O gives orange-red ppt. with 2,4-DNP reagent. It does not reduce Tollens’ reagent but gives yellow ppt. of iodoform on heating with NaOI. Compound X on reduction with LiAlH₄ gives compound ‘Y’ which undergoes dehydration reaction on heating with conc. H₂SO₄ to form But-2-ene. Identify the compounds X and Y.

Write the structures of the following:

(i) H₂SO₃ (ii) XeF₄

Give reasons:

(i) The -hydrogen atoms of aldehydes and ketones are acidic in nature.

(ii) Propanone is less reactive than ethanol toward addition of HCN.

(iii) Benzoic acid does not give Friedal-Crafts reaction.

OR

How can you convert?

(i) Toluene to Benzaldehyde

(ii) Ethanoic acid to 2-chloroethanoic acid

(iii) Acetone to Propane

An element crystallizes in a fcc lattice with cell edge of 400 pm. Calculate the density if 200 g of this element contain 2.5 × 10²⁴ atoms.