Question

For which of the following reactions, water gas is obtained as product?

• A. $C{H}_3-C\equiv CH\underset{H_{2}O}{\overset{O_3}{\to }}$
• B. $C{H}_4+H_{2}O\left(g\right)\stackrel{Ni/1273K}{⟶}$
• C. $C_6{H}_{14}\underset{△\left(773K\right)}{\overset{C{r}_2{O}_3/A{l}_2{O}_3,10-20atm}{\to }}$
• D. All of the above.

Answer 1

The correct option is B $C{H}_4+H_{2}O\left(g\right)\stackrel{Ni/1273K}{⟶}$

Water gas is a fuel gas consisting mainly of carbon monoxide and hydrogen.
For (a) :
Ozonolyis which gives methanoic acid and ethanoic acid
$C{H}_3-C\equiv CH\underset{H_{2}O}{\overset{O_3}{\to }}C{H}_{3}COOH+HCOOH$
For (b) :
Water gas is a fuel gas consisting mainly of carbon monoxide and hydrogen.
When methane reacts with steam at 1273 K in the presence of Nickel catalyst it forms carbon monoxide and dihydrogen gas.
$C{H}_4+H_{2}O\left(g\right)\stackrel{Ni}{⟶}CO+3H_2$

For (c):
Aromatization: n-Alkanes (C≥6) on heating to 773K at 10-20 atm in presence of oxides of vanadium, molybdenum or chromium supported over alumina get aromatized to benzene and its homologues.
$\underset{\text{n-hexane}}{C_6{H}_{14}}\underset{△\left(773K\right)}{\overset{C{r}_2{O}_3/A{l}_2{O}_3,10-20atm}{\to }}\underset{\text{Benzene}}{C_6{H}_6}$