Alkynes can undergo electrophilic addition when reacted with excess hydrogen halide (HX) to produce a dihalide. Consider the reaction of 4-methyl-4-phenyl-1-butyne with HCl. What is the major product?
a) 4-methyl-4-phenyl-1,2-dichlorobutane
b) 4-methyl-4-phenyl-1-chlorobutane
c) 4-methyl-4-phenyl-2-chlorobutane
d) 4-methyl-4-phenyl-1,1-dichlorobutane