A typical example of an exothermic reversible reaction conducted at high pressure in industry is

The correct answer is:
B. Methanol synthesis

✅ Explanation:
Methanol synthesis:
CO
+
2
H
2
⇌
CH
3
OH
Δ
𝐻
=
−
90.7
 
kJ/mol
CO+2H
2
​
⇌CH
3
​
OHΔH=−90.7kJ/mol
✔️ Exothermic: Releases heat

✔️ Reversible: Can go both forward and backward

✔️ High pressure: Conducted at 50–100 atm to favor the forward reaction (fewer gas moles on the product side)

✔️ Industrial process using Cu/ZnO/Al₂O₃ catalyst at 200–300°C

❌ Incorrect Options:
A. Dehydration of ethanol

C
2
H
5
OH
→
C
2
H
4
+
H
2
O
C
2
​
H
5
​
OH→C
2
​
H
4
​
+H
2
​
O
Endothermic and irreversible

Requires high temperature, not high pressure

C. Reformation of methane (Steam reforming)

CH
4
+
H
2
O
→
CO
+
3
H
2
CH
4
​
+H
2
​
O→CO+3H
2
​

Highly endothermic

Performed at high temperature, not necessarily high pressure

D. Polymerisation of ethylene

𝑛
C
2
H
4
→
(C
2
H
4
)
𝑛
nC
2
​
H
4
​
→(C
2
​
H
4
​
)
n
​

Exothermic but irreversible

Conducted at high pressure, but not reversible

✅ Final Answer: B. Methanol synthesis

Otlption B is right Answer, Pr-50-150 bar, Temp-250-300°C