In case of free expansion:
(i) $∆\mathrm{W}=0$
(ii) $∆\mathrm{Q}=0$
(iii) $∆\mathrm{U}=0$
(iv) $∆\mathrm{T}=0$
 

all are true in free expansion no work is done ,no change in internal energy ,no loss of heat and no change in temperature.