Identify the reagent used in following reaction.
$\text{Benzoic acid} \xrightarrow[\Delta]{\large{\text{Reagent}}} \text{Benzoyl chloride} + \text{phosphorous oxychloride} + \text{Hydrogen chloride}$

Which from following reactions occurs by removal of -CO- group from amide ?

Which from following pairs of carbohydrates contains galactose in both of them as one of the constituent ?

Which from following amino acids has a unique structure so that the side chain connects to the back bone of amino acid at two points ?