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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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Conversion of 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?

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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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