(2R)-chlorobutane can undergo nucleophilic substitution with NaBr. This reaction can proceed through either an SN2- or an Syl-mechanism.

a) Draw the mechanism, including the stereochemistry, of this reaction, include
intermediate(s) if
present, when assuming the reaction proceeds through an SN2-mechanism.

b) Sketch the graphical course of this SN2-reaction with the change in energy as function of the
reaction coordinate.

c) Why would you prefer to avoid an SNl-mechanism when you aim to achieve an enantiomerically
pure product? Explain your answer using the intermediate of this mechanism.

d) Why would you prefer to avoid an Sn1-mechanism even in the case a racemic mixture would be
permitted?

Would appreciate if you could answer even if one question!

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?