Calculate the concentration of benzoyl peroxide required to prepare polystyrene with a number-average molar mass of 750 kg mol−1 by bulk polymerization at 60 °C. Assume: (i) the initiator is 60% efficient; (ii) the rate coefficients for initiator dissociation, propagation and termination are, respectively, 2 × 10−6 s−1, 341 dm3 mol−1 s−1 and 4 × 107 dm3 mol−1 s−1; (iii) the density of styrene at the polymerization temperature is 0.88 g cm−3; and (iv) that termination by disproportionation, and chain transfer to initiator and monomer, are negligible. Radical Polymerization 119 (b) Calculate initial values of (i) the radical concentration and (ii) the rate of bulk polymerization expected for bulk polymerization

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

answer carbon and three oxygen atoms;