This is a single replacement. Because Zn flips with H, there is only one -ion (C2H3O2). C2H3O2 also known as Acetate looks different when it bonds with Zn, that’s why it looks different (CH3COO)2 on the product side.
Single: A + BC —> AC + B
Double: AB + CD —> AD + BC
Zn is you A, H is your B, C2H3O2 (Acetate) is your C.
