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Which A gives red colour in the reaction...

Which `A` gives red colour in the reaction
A` overset ((i) HNO_2)underset((ii) NaOH) (rarr)` red colur ?`

A

` CH_3CH_2NO_2`

B

` (CH_3)_2 CHNO_2`

C

`(CH_3)_2CHO_2`

D

.

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