Distinguish between
$(i)$ Hexagonal and monoclinic unit cells
$(ii)$ Face-centred and end-centred unit cells.

(N/A) $(i)$ Hexagonal unit cell:
For a hexagonal unit cell,$a = b \neq c$ and $\alpha = \beta = 90^{\circ}, \gamma = 120^{\circ}$.
Monoclinic unit cell:
For a monoclinic cell,$a \neq b \neq c$ and $\alpha = \gamma = 90^{\circ}, \beta \neq 90^{\circ}$.
$(ii)$ Face-centred unit cell:
In a face-centred unit cell,the constituent particles are present at all the corners and at the centre of each of the six faces.
End-centred unit cell:
An end-centred unit cell contains particles at all the corners and one at the centre of any two opposite faces.