Petroleum and fuels basics: Pick the single WRONG statement from the following set about LPG, flash point, fuel gas from distillation, and naphthalene source.

Introduction:
This question checks key fuel terminology and common industrial facts: how LPG is used, what “flash point” means, approximate fuel-gas generation in crude distillation, and the principal source of naphthalene. It asks you to spot the single incorrect statement.

Given Data / Assumptions:

• LPG composition mainly propane/butane with minor propylene/butylene traces.
• Flash point vs. fire point distinction.
• Crude distillation units vent off fuel gas streams of order tens of Nm^3 per tonne.
• Naphthalene is obtained predominantly from coal tar distillation, not crude oil.

Concept / Approach:
Evaluate each statement against standard definitions and industry practice. LPG is a versatile fuel and cutting gas (with oxygen). Flash point is a “just ignites briefly” temperature; sustained burning defines the fire point. Crude units produce refinery fuel gas in nontrivial quantities. By contrast, the major commercial source of naphthalene is coal tar from coking operations; crude oil yields are very low.

Step-by-Step Solution:
Check (a): True—LPG is widely used in vehicles and for heating; with O2, it supports metal cutting/heating.Check (b): True—flash point implies transient ignition, not sustained burning.Check (c): True as an order-of-magnitude statement for refinery fuel gas production.Check (d): False—maximum naphthalene yield comes from coal tar distillation.Check (e): True—LPG cylinders typically contain propane/butane liquefied under pressure.

Verification / Alternative check:
Textbook definitions and refinery process overviews corroborate the flash-point definition and naphthalene's coal-tar origin.

Why Other Options Are Wrong:

• Only (d) is incorrect; (a), (b), (c), and (e) are accurate.

Common Pitfalls:
Confusing flash point with fire point, and assuming all aromatics are crude-derived in large quantities.

Final Answer:
Maximum industrial yield of naphthalene is obtained from crude oil distillation.