MCQ
In this process product $A $ is


- ✓Fluorobenzene
- BBenzene
- C$1, 4$ -difluorobenzene
- D$1, 3$ -difluorobenzene


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$(I)$ They have high melting points, higher than those of pure metals
$(II)$ They are very hard
$(III)$ They retain metallic conductivity
$(IV)$ They are chemically more reactive than the pure metals