$[(eta^3-mathrm{C_3H_5})mathrm{Mn(CO)_4}]$ shows fluxional behavior. The ${}^{1}mathrm{H}$ NMR spectrum of this compound when it is in the non-fluxional state shows-
(a)one signal
(b)two signals in the intensity ratio of 4:1
(c)three signals in the intensity ratio of 2:2:1
(d)five signals of equal intensity.
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
A static η³-allyl has three proton environments: two syn H, two anti H and one central H — three signals in 2:2:1.