Carbon tetrabromide CBr

Using the periodic table as a guide, predict which of the following compounds form ionic solutions in water silicon carbide, SiC magnesium bromide, MgBr2 carbon tetrabromide, CBr chromic chloride, CrCl3. 

Nomura (25) investigated the effect of carbon tetrabromide, carbon tetrachloride and long chain mercaptans on the kinetics of emulsion polymerization of styrene. In the case of CBr and CCl the effect on the polymerization was attributed to desorption of the small chain transferred radicals. Similar results were obtained by Napper et al (26). Nomura also observed that the long chain mercaptan (n- dodecyl mercaptan) did not affect the number of particles and the rate, presumably due to the water-insolubility of the chain transferred radicals. 

Hodge s group has also used linear phosphinated polystyrene to form haloolefins from carbon tetrabromide and aromatic aldehydes (27). Using 2 mol equiv of phosphine, 1 mol equiv of CBr and 1 mol equiv of -tolualdehyde at 50 C for 16 h formed a 54% yield of the dibrominated alkene. Substitution of 1% or 8% DVB cross-linked polystyrene for linear polystyrene yielded 67% and 12% of dibrominated alkene under the same conditions (Table II). 

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