Q. Consider the following pairs:

1. Dorothy Hodgkin → Structure of Vitamin B12 using X-ray crystallography
2. Ahmed Zewail → Femtochemistry (ultrafast chemical reactions)
3. Richard Feynman → Laws of crystallography

Which of the above pairs is/are correctly matched?
Answer: Only 1 and 2
Notes: Dorothy Hodgkin accurately determined the structure of Vitamin B12 using X-ray crystallography, earning the Nobel Prize in Chemistry in 1964. Ahmed Zewail pioneered the field of femtochemistry, winning the Nobel Prize in Chemistry in 1999. Richard Feynman was a theoretical physicist, not known for contributions to crystallography, making the third pair incorrect.