Aldehydes and ketones can be halogenated at their α-position by reaction with cl2, br2, or i2, under acidic conditions. using br2 under acidic conditions, an intermediate enol is formed which adds bromine at the α-position. the reaction stops after the addition of one bromine because the electron-withdrawing halogen decreases the basicity of the carbonyl oxygen, making the protonation less favorable. draw curved arrows to show the movement of electrons in this step of the mechanism.

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.