Adding surfactants in non polar solvent, the micelles structure will look like

Solution

Chemistry ma’am · 4 steps

In an oily solvent the micelle turns inside out: polar heads hide in the centre and the tails face outward.

1. Two-part molecule. A surfactant has a polar head that likes polar surroundings and a long non-polar hydrocarbon tail that likes non-polar surroundings.
2. Like dissolves like. In a non-polar solvent, the tails mix happily with the solvent. The polar heads are the misfits, so they huddle together away from the solvent.
3. Reverse micelle. Above the critical micelle concentration, the molecules form a sphere with all the polar heads packed at the core and the tails pointing out into the solvent. This is a reverse micelle, the opposite of a micelle in water.

   Figure	Heads	Tails	Verdict
   (a)	clustered at the centre	outward, into the solvent	reverse micelle, correct
   (b)	outward, facing the solvent	pointing to the centre	normal micelle, for water
   (c)	in rows, exposed	in rows	no micelle formed
   (d)	scattered, exposed	scattered	no micelle formed

4. So. The structure is figure (a), with heads inside and tails outside. That is option (b).

The idea to keep. The part of the surfactant that matches the solvent always faces the solvent. In water the tails hide inside; in a non-polar solvent the heads hide inside.

Answer from the NTA final answer key. Solution by PrepWiser.