Based on the following information arrange four metals `A,B,C` and `D` in order of decreasing ability to act as reducing agents `:`
`(I)` Only A,B, and C react with `1M HCl` to give `H_(2)(g)`
`(II)` When C is added to solutions of the other metal ions, metallic B and D are formed
`(III)` Metal C dows not reduced `A^(n+)`

Options

A. `CgtAgtBgtD`
B. `CgtAgtDgtB`
C. `AgtCgtDgtB`
D. `AgtCgtBgtD`

Answer

4

Explanation

D is not reacted with HCl, So not easily oxidized at compare to A,B to C .
C is reduced B as well as D, but unable to reduce A.
So A is oxidised easily as compare to other metals.
`:." "` ability to act as easiy as compare to other metals.