1) Which reaction below is stereospecific?

a. bromination (no light) of 1-butene

b. hydroboration of Z-2-pentene

c. SN1 of (R)-2-butanol

d. SN2 of 1-bromobutane with NaCN

e. none of the above

2). The rate of SN2 of tert-butyl bromide is faster in polar aprotic solvents than in polar protic solvents. Why?

a. polar aprotic lower the potential energy of the product.

b. polar protic solvents are acids, which may protonate the carbocation intermediate.

c. Polar protic solvents raise the potential energy of tert-butyl chloride.

d. polar aprotic solvents lower the potential energy of the carbocation intermediate and transition state through electrostatic attractions.

e. none of the above