Show that in case of a first order reaction, the time taken for completion of $99 \%$ reaction is twice the time required for $90 \%$ completion of the reaction. $(\log 10=1)$
Resistance of a conductivity cell filled with 0.2 mol $\mathrm{L}^{-1} \mathrm{KCl}$ solution is $200 \Omega$. If the resistance of the same cell when filled with $0.05 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{KCl}$ solution is 620 , calculate the conductivity and molar conductivity of $0.05 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{KCl}$ solution. The conductivity of 0.2 $\mathrm{mol} \mathrm{L}^{-1} \mathrm{KCl}$ solution is $0.0248 \mathrm{~S} \mathrm{~cm}^{-1}$.
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.