Answer:

The surface tension of liquids is determined by the cohesive forces of molecules in the liquid. The stronger the cohesive forces, the higher the surface tension. Therefore, the liquid with the maximum surface tension will have the strongest intermolecular forces.

H2O (water)
Water has a very high surface tension due to the strong hydrogen bonding between its molecules. Water molecules are polar, and the positive and negative ends of the molecules attract each other, resulting in strong cohesive forces.

C6H6 (benzene)
Benzene is a nonpolar liquid, and it has weak intermolecular forces. Hence, it has a lower surface tension compared to water.

CH3OH (methanol)
Methanol is polar, and it has hydrogen bonding, which results in higher surface tension than benzene but lower than water.

C2H5OH (ethanol)
Ethanol is also polar and has hydrogen bonding, but it is larger than methanol, which makes it more difficult for the molecules to pack tightly, resulting in weaker cohesive forces. Therefore, it has lower surface tension than both water and methanol.

Conclusion
In conclusion, H2O (water) has the maximum surface tension out of the given liquids due to its strong hydrogen bonding and polar nature.

H2O has maximum due to strong Hydrogen bonding .