Question

1.Which solvent is suitable for an SN2 reaction mostly?

A.Ethanol B.Chloroform C.Hexane D.DMF

2.Sulfide,HS-,is better nucleophile than hydroxide,HO-,because

A.the negative charge in sulfide is more dense than that of hydroxide

B.the electronegativity of sulfur is higher than that of oxygen

C.the size of sulfur is bigger than that of oxygen

D.the polarizability of sulfur is less than that of oxygen

3.Polar proctic solvents can not be used for the Sn2 reaction. It is due to

A.that polar proctic solvent is solvating the transition state and it enhances stability.

B.that polar proctic solvent is solvating the transition state and the nucleophile as well.

C.that polar proctic solvent is miscible with water well.

D.that polar proctic solvent can be used as the nucleophile.