What is the different meaning between "although it is a practical tool" and "although is a practical tool"?

Question

English language interpretation

Answer 1

in the first sentence "it" is the object that is a practical tool. In the second " although" is the practical tool

Answer 2

"Although it is a practical tool" is saying that the object to which "it" refers is a practical tool and would be followed by a negative aspect of the object. e.g. "Although it is a practical tool, Wikipedia needs to be monitored constantly for erroneous information and bias".

The only way I can think of that "although is a practical tool" would be grammatically correct is if "although" is the subject and you think it's a useful preposition. e.g. "'Although' is a useful tool. In fact, I think 'although' is the most useful of all the prepositions."

Answer 3

the sentences are incomplete, however here goes -

"although it is a practical tool"  -- here, the tool referrred to is "it" which is the noun. they are trying to say that IT is a practical tool, however /but (in place of although) ....

eg.

"although a hammer (in place of "it") is a practical tool to drive in iron nails, it can also hurt your fingers badly if not aimed accurately"

"although is a practical tool" - here, the tool being referred to is "although" - probably as a language 'tool' /usage

eg. "although is a practical tool to use when comparing two or more alternative strategies"

hope this helps