What grade is nocturne op 9 No 2?

There's no single definitive grade for Chopin's Nocturne in E-flat major, Op. 9, No. 2. The difficulty level depends on the performer's skill and the edition used. However, it's generally considered to be an intermediate to late-intermediate piece. Some grading systems might place it at a grade 5 or 6 (on a scale of 1-8, for example), but this is very subjective.