An organic compound produces an orange precipitate when treated with 2,4-dinitro

Question

An organic compound produces an orange precipitate when treated with 2,4-dinitrophenylhydrazine in an acidic solution. The compound also reacts with Tollens reagent, Ag(NH3)2+OH-. Which compound is consistent with these observations? 2-pentanol 2-pentanone pentanal methyl pentanoate Which of the following methods cannot be used to produce the amide? What is the IUPAC name for this compound? 5-ethyl-4-hydroxy-2-hexanone 4-hydroxy-3-methyl-6-heptanone 2-ethyl-3-hydroxy-5-hexanone 4-hydroxy-5-methyl-2-heptanone

Explanation / Answer

(1) The answer for first question is PENTANAL. Carbonyl compounds give 2,4-DNP test positive but only CHO, aldehyde gives postive Tollen's test.

(2) Third chioce that is C6H5CHO + CH3NH2 -> C6H5C=N-CH3, which is an imine and amide cannot be formed by this combination.

(3) The answer is forth choice, that is 4-hydroxy-5-methyl-2-heptanone

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