Identify the product ' B ' in the following reaction.

$$ \text { Sodium phenoxide } \xrightarrow[6 \,atm]{\mathrm{CO}_2, 398 \mathrm{~K}} \mathrm{~A} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B} $$

Which from following d-orbitals has different shape as compared with others?

Which from following pairs of solutions in water exhibits same osmotic pressure at same temperature?

[molar mass of urea $=60 \mathrm{~g} \mathrm{~mol}^{-1}$, sucrose $=342 \mathrm{~g} \mathrm{~mol}^{-1}$ ]

Identify glycosidic linkage in maltose.