The ranking from lowest to highest melting point would be: Iodine, Paraffin, Sucrose, Sodium Chloride.
The melting points of substances depend on various factors such as molecular structure, bonding, and forces between molecules. Here's a general ranking based on typical melting points:
1. **Iodine:** Iodine exists as diatomic molecules (I2) held together by weak van der Waals forces. It has the lowest melting point among the given options.
2. **Paraffin:** Paraffin is a mixture of hydrocarbons, and its melting point can vary depending on the specific composition. However, it typically has a lower melting point compared to sodium chloride and sucrose.
3. **Sodium Chloride:** Sodium chloride (NaCl) consists of ionic bonds between sodium and chloride ions. Ionic compounds generally have higher melting points compared to molecular substances.
4. **Sucrose:** Sucrose (table sugar) is a molecular compound held together by covalent bonds. It generally has a higher melting point compared to iodine and paraffin but is lower than sodium chloride.
So, the ranking from lowest to highest melting point would be: Iodine, Paraffin, Sucrose, Sodium Chloride.
The probable question may be:
Rank the following molecules (1st, 2nd, 3rd, 4th) in the order that they melt.
Sucrose
Iodine
Sodium Chloride
Paraffin