Does the series in the attached image converge?

This is my attempt at a solution:

We have:

-1/2 + 1 -1/4 + 1/3 -1/6 + 1/5 -.....

I had this in an exam paper and answered that the series converges because the series:

1 - 1/2 + 1/3 - 1/4 + ...

converges (according to Liebniz).

But I only got 2/10 for the question because rearranging an infinite series can change the result. So how do I prove this series does or does not converge?

Thanks