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Aldehydes, Ketones and Carboxylic Acids

Short Answer Type

281.

Predict the major products of the following reactions and balance the equations:

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282. Predict the major products of the following reactions and balance the equations:

straight C subscript 6 straight H subscript 5 COOH space plus space PCl subscript 5 space rightwards arrow with heat on top space....

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283. Write the structures of A to D in the following sequence of reactions:

begin mathsize 14px style bold CH subscript bold 3 bold COOH bold space bold rightwards arrow from bold dry bold space bold distl to bold Ca bold left parenthesis bold OH bold right parenthesis subscript bold 2 of bold space bold A bold space bold rightwards arrow with bold HCN on top bold space bold B bold thin space bold rightwards arrow with bold H subscript bold 3 bold O to the power of bold plus on top bold C bold space bold rightwards arrow from bold Heat to bold H subscript bold 2 bold SO subscript bold 4 of bold D end style

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284. How will you perform the following conversions?
Ethanal into lactic acid.

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285. How will you perform the following conversions?
Ethanal into pent-3-en-one.

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286.
How does the reaction with NaHCO₃ helps in purifying CH₃CHO?

CH₃CHO is a carbonyl compound and gives an addition adduct with NaHSO₃. The addition adduct (hydrogen sulphite) is water soluble and can be converted back to the original carbonyl compound.

This can be achived by the decomposing the adduct by acid to generate pure ethanal leaving behind the impurities.

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287. Convert:
Ethyne into 1, 1-dimethoxy ethane

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288. Convert:
Ethyne into propanone.

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289. Write the structure of the major products of the following reactions:

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290. Write the structure of the major products of the following reactions:

CH subscript 3 CHO space rightwards arrow from left parenthesis ii right parenthesis space Heat to left parenthesis straight i right parenthesis space HCN divided by straight H to the power of plus of

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Previous Year Papers

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Short Answer Type

286. How does the reaction with NaHCO3 helps in purifying CH3CHO?

286.
How does the reaction with NaHCO₃ helps in purifying CH₃CHO?