Составте 5 типов вопросов к следующему предложению Mendeleyev investigated the chemical theory of solution. 

Mendeleyev investigated the chemical theory of solution. 1. Did Mendeleyev investigate the chemical theory of solution?-общий 2. What did Mendeleyev investigate?- специальный 3. Who  investigated the chemical theory of solution?- специальный к подлежащему 4. Mendeleyev investigated the chemical theory of solution, didn*t he?- разделительный 5. Did Mendeleyev or Butlerov investigate the chemical theory of solution?- альтернативный

1. Who investigated the chemical theory of solution? 2. What did Mendeleev investigate? 3. By whom was the chemical theory of solution investigated? 4. What theory did Mendeleev investigate? 5. Mendeleev investigated the chemical theory of solution, didn't he?