Rearrange the given phrases to form a sentence with superlative degre…

The correct answer is Option (2) → Iron is the most useful of all the metals.

Superlative degree:

• It compares one thing with all the others of its group.
• Pattern: Subject + verb + the most + adjective + of all + group
  • Subject: Iron
  • Verb with the article: is the
  • Superlative adjective: most useful
  • Group: of all the metals
• The given phrases in this order: Iron → is the → most useful → of all the metals.
  Example: Mount Everest is the highest of all the mountains in the world.

Why the Other Options are Incorrect?

Option 1: Iron of all metals is the most useful. — Incorrect.

• It drops "the" from the given phrase "of all the metals".
• The phrase comes between the subject and the verb, which breaks the normal order.

Option 3: Of all the metals most useful is the iron. — Incorrect.

• "The iron": a metal named in general takes no article.
• "most useful" loses its "the", so the superlative is incomplete.
• The order of subject and verb is turned around.

Option 4: Iron is of all the metals the most useful. — Incorrect.

• "Of all the metals" splits the verb "is" from "the most useful".
• The given phrase "is the" is broken up.