Which of the following pairs (Language - Country) is not correctly matched?

Which of the following pairs (Crop - Country) is not correctly matched?

Which of the following pairs (Country - Capital) is not correctly matched?

Which one of the following pairs is not correctly matched (Country - Capital)?

Which one of the following pairs (Capital - Country) is not correctly matched ?

Which one of the following pairs (Country - Oil field) is not correctly matched?