The occurrence problem asks if, given a group $G$ and a subgroup $H$ of $G$, there exists an algorithm to decide whether $x\in G$ belongs to $H$.

Let $G$ be a group that has solvable word problem.

1) Is the occurrence problem solvable for $H=[G,G]$? In other words,
Is there an algorithm to decide for any $x\in G$ whether $x$ belongs to $[G,G]$?

A slightly more general question: 

2) Is there an algorithm to decide whether $x \in G$ belongs to the $k$-derived subgroup (recall that the $k$-derived subgroup $G_k$ is defined recursively as $G_1= [G,G]$, $G_k=[G_{k-1},G_{k-1}]$).

Also, any reference to these topics is welcome.