Final answer:
Both CBr₄ (carbon tetrabromide) and P₄O₆ (phosphorus hexoxide) option (b) are molecular compounds, as they are composed of nonmetals bonded through covalent bonds. FeS (iron sulfide) is not a molecular compound; it is an ionic compound as it consists of a metal and a nonmetal with ionic bonding.
Step-by-step explanation:
The question is asking which of the given compounds are molecular. A molecular compound generally consists of nonmetals bonded together, sharing electrons through covalent bonds.
b) Both CBr₄ and P₄O₆ are molecular compounds. CBr₄ (carbon tetrabromide) is composed entirely of nonmetals, carbon, and bromine. Similarly, P₄O₆ (phosphorus hexoxide) is made up of phosphorus and oxygen, both of which are nonmetals.
a) CBr₄ is a molecular compound. d) FeS (iron sulfide) is not molecular; it is an ionic compound comprised of a metal (iron) and a nonmetal (sulfur), and these elements form ionic bonds rather than covalent ones.
Therefore, the correct answer to which of these compounds are molecular is b) both CBr₄ and P₄O₆.