Write the IUPAC names of the following coordination compounds (any three):

(a) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}\left(\mathrm{NO}_2\right)\right] \mathrm{Cl}$

(b) $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_2$

(c) $\mathrm{K}_3\left[\mathrm{Cr}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$

(d) $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Br}_2\right]^{+}$

Give the structure of the major product expected from the following reactions:

(a) Reaction of ethanal with methyl-magnesium bromide followed by hydrolysis.

(b) Hydration of But-1-ene in the presence of dilute sulphuric acid.

(c) Reaction of phenol with bromine water.

Draw the structures of major product(s) in each of the following reactions:

Calculate the emf of the following cell:

$$\mathrm{Ni}(\mathrm{~s})+2 \mathrm{Ag}^{+}(0.01 \mathrm{M}) \rightarrow \mathrm{Ni}^{2+}(0.1 \mathrm{M})+2 \mathrm{Ag}(\mathrm{~s})$$

Given that $\mathrm{E}_{\text {cell }}^{\circ}=1.05 \mathrm{~V}, \log 10=1$