Exhibit 19-4 α,β-Unsaturated Aldehydes and Ketones Can Undergo Reaction with Nucleophiles at Nucleophiles

Multiple Choice

Exhibit 19-4
α,β-Unsaturated aldehydes and ketones can undergo reaction with nucleophiles at the β carbon,as shown below.
-Refer to Exhibit 19-4.This reaction is called _____ reaction.

A) a 1,2-conjugate addition.
B) an electrophilic addition.
C) a direct addition
D) a 1,2-addition.