Why adding HBr to 2,4-hexadiene provides direct addition and conjugate addition products, while addition of HBr to 1,5-hexadiene provides only direct addition product?

answer is a

explanation:

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

that's what i got you can count the number of atoms