Which elements can react to produce a molecular compound?
(1) calcium and chlorine
(2) hydrogen and sulfur
(3) lithium and fluorine
(4) magnesium and oxygen

 The  elements that can react  to produce a molecular  compound is  hydrogen  and sulfur

Explanation

A  molecular compound is   formed  when two or more atoms join by  sharing  electrons through  a  covalent  bond.   Sharing of atoms  occurs  mainly  between non metals.
Hydrogen ( a non metal)  and sulfur(a non metal) react to form  a molecular compound  by sharing electron among themselves.2 hydrogen  atom   bond  with 1 atom sulfur  to form hydrogen sulfide.