Given that Six products - Ariel, Vivel, Rin, Nirma, Gillette Gel and Pepsodent
From 1st condition: Rin and Ariel are next to each other.
From 2nd condition at least two products are between Ariel &Nirma
From 3rd condition Pepsodent is kept between Gillette Gel and Rin, and at least 2 products between Pepsodent and Vivel.
From 4th condition: Vivel and Rin can not be next to each other.
From 5th condition Vivel is not kept at 1st window.
Final arrangement would be Nirma Gillette Pepsodent Rin Ariel Vivel
Except Rin , the product displayed left of Ariel but right lof Gillette Gel is Pepsodent.
