Which of the following is the strongest reducing agent?

If standard reduction potential $(E^{\circ})$ of $(Mg^{2+}_{(aq)} \mid Mg_{(s)})$,$(Ag^{+}_{(aq)} \mid Ag_{(s)})$,$(Zn^{2+}_{(aq)} \mid Zn_{(s)})$ and $(Cu^{2+}_{(aq)} \mid Cu_{(s)})$ are $-2.37 \ V$,$+0.79 \ V$,$-0.76 \ V$ and $+0.34 \ V$ respectively. Which of the following reaction is spontaneous?

The standard reduction potentials for $Al^{3+} | Al$,$Fe^{2+} | Fe$,and $Br_2 | Br^-$ are $-1.66 \ V$,$-0.45 \ V$,and $1.09 \ V$ respectively. What is the correct order of their reducing power?

The standard electrode potentials $E^{\circ} (V)$ for $Li^{+} / Li$ and $Na^{+} / Na$ respectively are:

What is the standard electrode potential of a Daniell cell (in $V$)?

The standard electrode potential (in $V$) values for $Al^{3+}/Al$ and $Tl^{3+}/Tl$ are respectively: