Conjugated dienes react with radicals by both 1,2 and 1,4 addition. Write a detailed mechanism to account for this fact using the hydrogen peroxide-promoted addition of one molar equivalent of HBr to 1,3-butadiene as an illustration.

Fill in the blanks for the following statements: the rms speed of the molecules in a sample of h2 gas at 300 k will be times larger than the rms speed of o2 molecules at the same temperature, and the ratio µrms (h2) / µrms (o2) with increasing temperature. a not enough information is given to answer this question b sixteen, will not change c four, will not change d four, will increase e sixteen, will decrease