Use variable with string (with spaces) as value in grep

Question

My variable $pepe has the name of a file (with spaces) as value, and I want to use the grep command to find that file in ls -l. The problem is that I can literally write it but I cannot use it if its set inside $pepe.

In the image you can see what I tried.

Answer 1

enter image description here

Here you have the image, I don't know why it didn't appear.