To what extent it is possible to measure that?

[Paulo Dias]

I would like to know which one of the following is the most correct choice:

1) To what extent it is possible to measure that?
2) To what extent is it possible to measure that?

Please let me know.

THanks
Paulo Dias
Email: Paulo.Dias@ca.com

[Torsten]

Both sentences can be correct, please look at these examples:

To what extent is it possible to measure that?
(main clause)

I don't know to what extent it is possible to measure that. (subordinate clause)
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Camoes]

Thanks, but isn't that a double question?

Sorry to insist on this one. I am confused.

I was told we should not use double questions.

For example, isn't the following wrong:
"Can you tell me where is the bathroom?"
I was told the correct question should be:
"Can you tell me where the bathroom is?"

Please let me know your opinion.
Thanks

Paulo Dias.

[Torsten]