Which of the following species can act as reducing agent ?

CHEMISTRY · Single correct · A Level · Chemistry · Transition metals and their chemistry · Transition metals and their chemistry

Problem

Which of the following species can act as reducing agent ? (1)

[Co(CO)_4]^-

(2)

Mn(CO)_6

(3)

Mn(CO)_5

(4)

Cr(CO)_6