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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.
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when 3.02g NH4Cl solid was dissolved in 20.05 ml water the temperature of the water dropped from 19.8 degrees celcius to 9.1 degrees celcius
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