Aromatic carbonyl compounds having molecular formula $C_{8} H_{8} O$ react with $N H_{2} O H .$ How many isomeric oximes can be formed .

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answer is 10.

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Detailed Solution

Isomeric Oximes Formed from Aromatic Carbonyl Compounds (C₈H₈O)

Aromatic carbonyl compounds with molecular formula C₈H₈O include:

Methyl benzaldehydes (ortho, meta, para isomers)
Benzaldehyde
Acetophenone (phenyl methyl ketone)

When these compounds react with hydroxylamine (NH₂OH), oximes are formed. The count of isomeric oximes depends on the nature of the carbonyl group:

Aldehydes (benzaldehyde and its methyl derivatives) typically form 1 oxime isomer per compound.
Ketones (acetophenone) form 2 isomers of oximes due to syn and anti geometrical isomers.

Counting the isomeric oximes:

3 (methyl benzaldehydes) × 1 + 1 (benzaldehyde) × 1 + 1 (acetophenone) × 2 = 6

Final Answer:6 isomeric oximes can be formed.