Answer 1

CH₃-CH=CH₂+Cl₂ → Cl-CH₂-CH=CH₂+HCl
Prpene (42) (71) Allyl chloride (76.5) (36.5)
% Atom economy = molecular weight of product/total mol. Weight of reactants * 100
=76.5/42+71 * 100
=76.5/113 * 100
= 67.7%
% Atom economy = 67.7%