A deuterium compound (A) which is used as a moderator in nuclear reactor reacts with Ca to form compound B. A reacts with `SO_2` to give compound C. Upon electrolysis compound A gives deuterium molecule. Identify A, B and C.

An isotope of hydrogen reacts with oxygen to give compound (A), which is used as a moderator in nuclear reactor. Like hydrogen, this isotope also undergoes addition reaction. It reacts with ethylene to give compound B, which is a saturated hydrocarbon. Identify the element A and B. A is radioactive.

BF_(3) reacts with LiH and forms a compound A. The compound A reacts with water to give the compound B. A reacts with ammonia at 390 K and form C. Identify (A), (B) and (C).

The compound which gives off oxygen on moderate heating is :

From above compound (A), (B), (C) & (D) chiral compound is :

An element occupies group number 1 and period number 2. This element burns with air and forms compound A. With water, it gives compound B, with hydrogen it forms an ionic compound C. Identify the elements, A, B and C.

How do carbonyl compounds react with HCN. Give mechanism of the reaction.