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MCQMediumJEE Main 2025 · 7 April, Shift 2Aldehydes & Ketones

Chemistry Question from JEE Main 2025 · 7 April, Shift 2

"P" is an optically active compound with molecular formula C6H12OC_6H_{12}O. When "P" is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a negative test. Predict the structure of "P".

Four structural options for a compound with molecular formula C6H12O, showing ketone and aldehyde carbonyl-containing chain structures labeled 1 to 4.
  • A
    Structure labeled 1 showing a straight-chain ketone, CH3COCH2CH2CH2CH3, corresponding to 2-hexanone.
  • B
    Structure labeled 2 showing CH3COCH(CH3)CH2CH3, a ketone with a stereogenic carbon, corresponding to 3-methyl-2-pentanone.
  • C
    Structure labeled 3 showing HCOCH2CH(CH3)CH2CH3, an aldehyde chain structure corresponding to 3-methylpentanal type connectivity.
  • D
    Structure labeled 4 showing CH3COCH2CH(CH3)CH3, a branched ketone corresponding to 4-methyl-2-pentanone.

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