a. Give the curved arrow-pushing and the Allowed product of the following cycloaddition. State whether the product is achiral, a meso compound, a pure enantiomer or a racemic mixture. H&CO OHC A B CHO heat b. Draw the HOMO for reactant A and the LUMO for reactant B on top of the structures below H3CO A HOMO OHC B LUMO CHO c. Does the allowed reaction proceed suprafacial/suprafacial or suprafacial/ antarafacial

Draw the product of each SN2 reaction and indicate stereochemistry. CH3CH₂ a. H C-Br + OCH₂CH3 b. + -CN

Select the major product for the following reactions Br₂ EtOH A. B. C. D. E. Me e H H + enantiomer Br.. Ber: JBr + enantiomer Asal Br +enantiomer Eto... enantiomer QEt + enantiomer

A generic solid, X, has a molar mass of 77.577.5 g/mol. In a constant‑pressure calorimeter, 23.323.3 g of X is dissolved in 297297 g of water at 23.00 °C. X(s)⟶X(aq) The temperature of the resulting solution rises to 29.5029.50 °C. Assume the solution has the same specific heat as water, 4.184 J/(g·°C), and that there is negligible heat loss to the surroundings. How much heat was absorbed by the solution? q=          kJ What is the enthalpy of the reaction? Δ?rxn=.  kJ/mol

Draw it out

HCCH In this reaction, which species acts as the electrophile? H3C HọC-N-B-H Học® H CH3 H H;C CHy B. H H CC O a. CCL O b. H;C H H;C-N-B-H H;C® H Oc. CH3 Hoc CH3 O d H .B.

2. When the molecule shown below is heated up in water, two alcohols that are constitutional isomers are formed. Predict the structures for the two alcohols. Which do you suppose would be major? Why? Show the mechanism for the reaction you are proposing. Is your mechanism an SN1, SN2, E1, or E2 pathway? H c- Br Which major? alcohol A Why major? mechanism: Mechanism pathway: SN1 or alcohol B SN2 El alcohol A alcohol B Are your alcohols A and B constitutional isomers? Y N E2

R.

6. Determine whether the following reactions are SN1 or SN2. Draw the mechanism and the products with stereochemistry. a. b. Br Br + "CN + -OCH 3 acetone DMSO d. e. f. Br 11 + CH3OH + CH3CO₂H Dº Br + -OCH₂CH3 + CH3CH₂OH DMF 1, 2 of 2

Draw tructural or or he ajor roduct f he eaction shown. CH3CH=CHCH3 Cl2 • Do not show stereóchemist in other cases. • If the reaction produces a racemic mixture, just draw one stereoisomer. • Show product stereochem IF the reactant alkene has both carbons of the double bond within a ring. C. opy P. C. progress ChemDoodle (Previous Submit Answer Retry Entire Group 9 more group attempts remaining