The correct order of ease of dehydration of following is:

• I > II > III

• III > II > I

• I > III > II

• III > I > II

The structure of intermediate A in the following reaction, is

463.

The compound that is most difficult to protonate is :

• 

• 

• 

• 

For the chemical reaction:

N₂(g) + 3H₂(g) $\rightleftharpoons$ 2NH₃(g)

The correct option is:

• $-\frac{\mathrm{d}\left[{\mathrm{N}}_2\right]}{\mathrm{dt}}= 2\frac{\mathrm{d}\left[{\mathrm{NH}}_3\right]}{\mathrm{dt}}$

• $-\frac{\mathrm{d}\left[{\mathrm{N}}_2\right]}{\mathrm{dt}}= \frac{1}{2}\frac{\mathrm{d}\left[{\mathrm{NH}}_3\right]}{\mathrm{dt}}$

• $3\frac{\mathrm{d}\left[{\mathrm{H}}_2\right]}{\mathrm{dt}}= 2\frac{\mathrm{d}\left[{\mathrm{NH}}_3\right]}{\mathrm{dt}}$

• $-\frac{1}{3}\frac{\mathrm{d}\left[{\mathrm{H}}_2\right]}{\mathrm{dt}}= -\frac{1}{2}\frac{\mathrm{d}\left[{\mathrm{NH}}_3\right]}{\mathrm{dt}}$