In the following reaction

Identify X and Y.

Which of the following disaccharide will not reduce Tollen's reagent?

Write the balanced chemical equation for developing a back and white photographic film. Also explain why the solution of sodium thiosulphate on acidification turns milky white.

$$F{e^{3 + }}\buildrel {SN{C^ - }(excess)} \over \longrightarrow $$ blood red $$F{e^{3 + }}\buildrel {SN{C^ - }(excess)} \over \longrightarrow $$ colourless (B):

(A) Identify compound A and B and write their IUPAC names.

(B) Determine the spin only magnetic moment of B.