Determine whether each of these reactions occur through an SN1 , SN2 , E1, or E2 mechanism. A. 1 bromo pentane is treated with sodium methanethiolate in acetonitile to give a thioether product. A. The mechanism of reaction A is: E2 SN2 E1 SN1 B. 1 bromo pentane is treated with sodium methoxide in methanol to give an ether product. B. The mechanism of reaction B is: E1 SN1 E2 SN2 C. 1 bromo pentane is treated with potassium tert butoxide in tert butanol to give 1 pentene. C. The mechanism of reaction C is: E1 SN2 E2 SN1