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Q.
The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by :
isochoric $\to$ Process d
isobaric $\to$ Process a
Adiabatic slope will be more than isothermal
so
Isothermal $\to$ Process b
Adiabatic $\to$ Process c
order $\to$ a d a b c