Question

Which part of a detergent molecule interacts with grease?

Options

• The polar head

• The non-polar tail

• The ionic center.

• The sulphate group

Answer 1

The non-polar tail

Explanation:

A detergent molecule has two distinct parts:

• Non-polar tail (hydrophobic/lipophilic), a long hydrocarbon chain that is repelled by water but attracted to grease and oil
• Polar head (hydrophilic), an ionic group that is attracted to water

When the detergent is applied, the non-polar tail buries itself into the grease, while the polar head remains in the water. This forms a micelle that surrounds and lifts the grease away.