Classify the following sugars into monosaccharides and disaccharides:

Galactose, Glucose, Lactose and Maltose

(a) Carry out the following conversions:

(i) Nitrobenzene to Aniline

(ii) Aniline to Phenol

OR

(b) (i) Write a chemical test to distinguish between Dimethyl amine and Ethanamine.

(ii) Write the product formed when benzene diazonium chloride is treated with KI.

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 $0.0248 \mathrm{~S} \mathrm{~cm}^{-1}$.