For the following reaction through stages I, II and III.$\text{A\hspace{0.17em}}\stackrel{\text{I}}{\to }\text{\hspace{0.17em}B\hspace{0.17em}}\stackrel{\text{II}}{\to }\text{\hspace{0.17em}C\hspace{0.17em}}\stackrel{\text{III}}{\to }\text{\hspace{0.17em}D}$ .

Quantity of the product formed (x) varies with temperature (T) as given. Select correct statement.

Stage – I (A to B) : The quantity of B is more than that of A. This means formation

of B is favoured with increase in temperature, T. Thus state – I must be endothermic. State – II (B to C) : The quantity of C is less than that of B. Thus the formation of C is less of favoured with an increase in temperature. Hence state – II must be exothermic.  Stage – III (C to D) : Following from above, state – III must be endothermic