SI unit of surface tension is 

Explanation:

Surface Tension: 

It is defined as force per unit length in the plane of the liquid surface at right angles to either side of an imaginary line drawn to the surface.

Mathematically, 

\(\rm Surface\;Tension = \frac{{Force}}{{Length}}\)

• It is the tendency of the liquid surface to shrink into a minimum surface area.
• The SI Unit of surface tension is N m-1
• It allows insects to float and slide on the water surface, usually more dense than water
• The molecules at the surface have unbalanced force rather than molecules at deeper and the resultant force moves downward this is surface tension.
• Dimensional formula is MT-2

Note:

In this question, the correct option is given in the CGS unit but the question is asked about the SI unit. So The marked option is the most appropriate.