For the gaseous phase reaction 

, initially there are 2 mole each of A&B. If 0.4 mol of D is present at equilibrium at a given T & P, incorrect relationship is

According to stoichiometry

i) 2 molesof A gives 1 mole of D

     ______    gives 0.4 moles of D

   moles of A reacted = 0.8

ii) 1 mole of B gives 1 mole of D

    _____ gives 0.4 moles of D

moles of B reacted = 0.4

iii) when 2 moles of 'C' is formed then 1 mole of D is formed

     ________ is formed then 0.4 moles of D is formed

     moles of C formed = 0.8

Initial moles	2	2		-	-
Moles at equilibrium	(2- 0.8)	(2- 0.4)		0.8	0.4

At equilibrium

n_A = 1.2

n_B = 1.6

n_C = 0.8

n_D = 0.4

Pressure exerted by gas α number of moles

Option 1	PA < PB .... correct
	PD < PC .... correct
Option 2	PA < PC .... correct
	PB < PC .... correct
Option 3	PC < PD .... correct
	PA <  .... correct
Option 4	PA < PB .... correct
	PA < PB .... correct
Thus only option (2) is incorrect.