MCQ
Nitro group in Nitro benzene is a ………….
- Aortho directing group
- ✓Meta directing group
- CPara directing group
- Dortho and para directing group
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| List - I | List - II |
| A. Bragg's equation | 1. $\frac{n M }{a^3 N _{ A }}$ |
| B. Density of unit cell | 2. $\frac{\text { Total volume of all spheres in unit cell }}{\text { Volume of unit cell }} \times 100$ |
| C. Packing efficiency | 3. $\frac{r_{C^{-}}}{r_{ A ^{-}}}$ |
| D. Radius ratio | 4. $n \lambda=2 d \sin \theta$ |