how many version does nocturn by chopin have?

Answer 1

This is the complete list of nocturnes written by Chopin (from Wikipedia)

* Opus 9:
o No. 1: Nocturne in B-flat minor
o No. 2: Nocturne in E-flat major
o No. 3: Nocturne in B major
* Opus 15:
o No. 1: Nocturne in F major (1830-1831)
o No. 2: Nocturne in F-sharp major (1830-1831)
o No. 3: Nocturne in G minor (1833)
* Opus 27:
o No. 1: Nocturne in C-sharp minor
o No. 2: Nocturne in D-flat major
* Opus 32:
o No. 1: Nocturne in B major (1836-1837)
o No. 2: Nocturne in A-flat major (1836-1837)
* Opus 37:
o No. 1: Nocturne in G minor
o No. 2: Nocturne in G major
* Opus 48:
o No. 1: Nocturne in C minor
o No. 2: Nocturne in F-sharp minor
* Opus 55:
o No. 1: Nocturne in F minor
o No. 2: Nocturne in E-flat major
* Opus 62:
o No. 1: Nocturne in B major
o No. 2: Nocturne in E major
* Opus posth. 72:
o No. 1: Nocturne in E minor
* Posthumously published:
o Nocturne in C-sharp minor (1830)
o Nocturne in C minor (1837)

Answer 2

Which nocturne ? He wrote many.