Pick out the wrong statement.

• LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
• The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
• Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
• Maximum yield of naphthalene is obtained on distillation of crude oil.