Which one of the following compounds is considered to be a molecular compound?

BlackTom题目解析

Question

Which one of the following compounds is considered to be a molecular compound?

BlackTom题目解析

BlackTom AI · Accepted Answer

Consider the question: which of the listed compounds is a molecular compound? 
Option 1: PCl3. This species consists of discrete molecules formed by covalent bonds between phosphorus and chlorine atoms. Such compounds are typically volatile, have low melting points compared to ionic solids, and exist as individual molecular units rather than a continuous lattice. 
Option 2: NaBr. This compound is formed from a metal (sodium) and a nonmetal (bromine) and typically crystallizes as an ionic lattice. The bonding is largely ionic, not covalent, and it behaves as a salt with strong electrostatic attractions in the solid state. 
Option 3: Al2O3. Aluminum oxide is a classic example of an ionic solid with a strong lattice structure arising from charge transfer between aluminum cations and oxide anions. It exhibits high melting points and does not consist of discrete molecules. 
Option 4: Mg3P2. This material is also expected to be ionic in character, composed of magnesium cations and phosphide anions arranged in a lattice, rather than existing as independent molecular units. 
In summary, the distinguishing feature of a molecular compound in this set is the presence of covalent bonds within discrete molecules rather than an extended ionic lattice, which is characteristic of the compounds listed in options 2–4. The covalent, discrete-molecule nature of PCl3 aligns with the concept of molecular compounds, whereas the other options fit the description of ionic substances.

Which one of the following compounds is considered to be a molecular compound? BlackTom题目解析

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