COCO MADEMOISELLE by Chanel Eau De Parfum Spray 3.4 oz / 100 ml (Women)

Hi. Is this sample a genuine Chanel product?

Why is the price higher for 1.7 oz than it is for the 3.4 Oz from the Chanel site?

There are several variations of this perfume. i chose trhe defaulted "musk" and love it! but, can't find it, help?

Can you buy just the refill for Mademoiselle Chanel?