In the given chemical reaction, colors of the Fe²⁺ and Fe³⁺ ions, are respectively :

5Fe²⁺ + MnO$$_4^ - $$ + 8H⁺ $$\to$$ Mn²⁺ + 4H₂O + 5Fe³⁺

The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are :

In the following sequence of reactions,


The compounds B and C respectively are :-

Given below are two statements :

Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.

Statement II : The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.

In the light of the above statements, choose the most appropriate answer from the options given below :