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.

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 (A) reacts with diatomic molecule of element which occupies group number 16 and period number 2 to give compound (B) is used as a modulator in nuclear reaction. (A) adds on to a compound (C), which has the molecular formula C3H6 to give (D). Identify A, B, C and D.

An element A occupies group number 15 and period number 3, reacts with chlorine to give compound B. The compounds B on hydrolysis gives a dibasic acid C. The compound C on heating undergoes auto oxidation and reduction to give a tribasic acid D. Identify the elements A, compounds B, C and D. Write the reactions.

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).

An alkali metal hydride (NaH)reacts with diborane in A to give a tetrahedral compound B which is extensively used as reducing agent in organic synthesis. The compounds A and B respectively are,

The chief ore of Zinc, on roasting gave a compound A, which on reduction by carbon, gives B. Identify A and B, give the chemical reactions.

Compound (A) with Molecular formula C_(7)H_(6)O does not reduce Fehling's solution. Compound (A) reacts with acetone in the presence of NaOH to give a compound (B), which is an alpha, beta -unsaturated compound. Further (A) reacts with dimethyl aniline in the presence of conc. H_(2)SO_(4) to give compound (C) which is a dye. Identify (A), (B) and (C). Explain the reactions.