Chemistry · Aldehydes and Ketones
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It is the general formula of:

- A
2, 4-Dinitrophenyl hydrazine
- B
1, 3-Dinitrophenyl hydrazone
- C
Phenyl hydrazone
- D
2, 4-Dinitrophenyl hydrazone
Hydrazone consists of a carbon-nitrogen double bond, i.e., R1R2C=NNH2. In Phenyl hydrazone, one H atom of hydrazone is replaced by a phenyl ring. Now if we attach two nitro groups at positions 2 and 4, as given in the question, the product we have is 2,4-nitrophenyl hydrazine.
It is hydrazine, not hydrazone, hence correct
The position of nitro groups on phenyl ring is not correctly specified
It has the the general formula of R1R2C=NNH2.
Already explained “incorrect”.
Tagged under Chemistry · Aldehydes and Ketones · 2016