Mercury because it lives in liquid state and it's poor conductor..Gold is also not a good conductor of electricity

Introduction:
In this question, we are asked to identify the metal that is a poor conductor of electricity. There are four options given: Gold, Iron, Aluminium, and Mercury. We need to analyze each metal and determine which one is the correct answer.

Explanation:
1. Gold:
Gold is known for its excellent conductivity of electricity. It is a good conductor and therefore, it is not the correct answer.

2. Iron:
Iron is also a good conductor of electricity. It is widely used in electrical wiring and other electrical applications. Hence, it is not the correct answer.

3. Aluminium:
Aluminium is a good conductor of electricity. It is commonly used in electrical transmission lines due to its high conductivity. Therefore, it is not the correct answer.

4. Mercury:
Mercury is a poor conductor of electricity and therefore, it is the correct answer. Mercury is a liquid metal at room temperature and has a very low conductivity compared to other metals. It is often used in thermometers and barometers due to its unique properties.

Conclusion:
From the given options, the metal that is a poor conductor of electricity is Mercury. It is important to note that while gold, iron, and aluminium are all good conductors of electricity, mercury stands out as a poor conductor.