NBS is used to substitute a bromine atom for a hydrogen atom at an allylic or benzylic carbon atom. The source of the bromine atom, molecular bromine, is produced in low concentrations by NBS through a mechanism involving movement of both single electrons and pairs of electrons. Provide the missing arrows in the boxes to show how NBS (N-bromosuccinimide) reacts with an alkene to substitute a bromine atom for a hydrogen atom at an allylic (or benzylic) carbon.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Why are people not able to scuba dive in the deep part of the ocean

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.