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How many compounds out of following will...

How many compounds out of following will give blue colour when it is converted into Lassaigne's extreat and `FeSo_(4)` is added followed by `FeCl_(3)`.
(a) `CH_(3)CH_(2)-N Me_(2)` (b) `CH_(3)-Cl`
(c ) `NH_(2)-NH_(2)` (d)
(e) `Me_(2)C=N-OH` (f) Ph-CN

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