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Aldehydes, Ketones and Carboxylic Acids

Short Answer Type

291. Organic compound A(C₃H₈O) gives brisk effervescence with Na metal and on reaction with Cu at 573 K gives B (C₃H₆O). Compound B gives a yellow ppt. with I₂ and alkali B on reaction with semicarbazide gives C. what are the structures of compounds A, B and C? Write all reactions involved.

Organic compound A is an alcohol as it gives a reaction with Na metal and contains one oxygen.
B is either an aldehyde or ketone but as it gives yellow ppt. with I₂/NaOH, it is a ketone, CH₃COCH₃. Therefore A is a secondary alcohol.

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292. Organic compound A(C₅H₁₀O), capable of being resolved into optical isomers gives a yellow precipitate with 2, 4-dinitrophenyl hydrazine
(i) Write the structure and IUPAC name of organic compound A.

(ii) What happens when this organic compound ‘A’ reacts with diamine silver (I) ion in alkaline medium?

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293.

Explain haloform reaction.

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294.

Complete the following:

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295.

Complete the following:

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296.

Complete the following:

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297.

Give the products of heating each of the following under the condition mentioned

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298.

Give the products of heating each of the following under the condition mentioned
$CH subscript 3 CH subscript 2 CH space equals space CH space minus CHO space rightwards arrow from HCl to Zn divided by Hg of$