$R$ and $S$ are relations, prove about $S\setminus R$

Question

1. If $R$ and $S$ are reflexive then $S\setminus R$ is reflexive.
2. If $R$ and $S$ are symmetric then $S\setminus R$ is symmetric.
3. If $R$ and $S$ are transitive then $S\setminus R$ is transitive.

and I would also like to ask about the empty group, what can we say about it being reflexive, symmetric, transitive?