Complete the following reactions:

(i)

(ii)

(iii)

(iv)

How can the production of dihydrogen, obtained from ‘coal gasification’, be increased?

Describe the bulk preparation of dihydrogen by electrolytic method. What is the role of an electrolyte in this process ?

Discuss the consequences of high enthalpy of H–H bond in terms of chemical reactivity of dihydrogen.

What do you understand by (i) electron-deficient, (ii) electron-precise, and (iii) electron-rich compounds of hydrogen? Provide justification with suitable examples.