Question

(A) Process-I is not isochoric, V is decreasing.
(B) Process-II is isothermal expansion
$∆$U = 0,  W > 0
$∆$Q > 0
(C) Process-IV is isothermal compression,
$∆$U = 0,  W < 0
$∆$Q < 0
(D) Process-I and III are NOT isobaric because in isobaric process T $\infty$ V hence isobaric T–V graph
will be linear.