Match the following and identify the correct option.

(a) $\mathrm{CO}\left(\mathrm{g}\right)+{\mathrm{H}}_{\mathrm{2}}\left(\mathrm{g}\right)$	(i) $\mathrm{Mg}{\left({\mathrm{HCO}}_3\right)}_2+\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$
(b) Temporary hardness of water	(ii) An electron deficient hydride
(c) ${\mathrm{B}}_2{\mathrm{H}}_6$	(iii) Synthesis gas
(d) ${\mathrm{H}}_2{\mathrm{O}}_2$	(iv) Non-planar structure

• A

  (a)-(iii); (b)-(ii); (c)-(i); (d)-(iv)
• B

  (a)-(iii); (b)-(iv); (c)-(ii); (d)-(i)
• C

  (a)-(i); (b)-(iii); (c)-(ii); (d)-(iv)
• Correct answer
  D

  (a)-(iii); (b)-(i); (c)-(ii); (d)-(iv)

Hence, the correct answer is option: 'D'.