Which of the following has the lowest melting point?

Tin

The correct answer is option 2. Tin.

Among the listed options, Zinc (Zn) has the lowest melting point. Here's a breakdown of their melting points:

Silver (Ag): 961.9 °C

Tin (Sn): 231.9 °C (Lowest)

Zinc (Zn): 419.5 °C

Lead (Pb): 327.5 °C

Therefore, based on their melting point values, zinc stands out as the element with the easiest transition from solid to liquid state at a lower temperature.