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251. Describe the following:
Cross aldol condensation

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252. Describe the following:
Decarboxylation.

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254. Complete each synthesis by giving missing starting material, reagent or products.

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255. Complete each synthesis by giving missing starting material, reagent or products.

begin mathsize 14px style bold C subscript bold 6 bold H subscript bold 5 bold CHO bold space bold rightwards arrow with bold H subscript bold 2 bold NCONHNH subscript bold 2 on top end style

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256. Complete each synthesis by giving missing starting material, reagent or products.

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257. Complete each synthesis by giving missing starting material, reagent or products.

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258. Complete each synthesis by giving missing starting material, reagent or products.

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259. Complete each synthesis by giving missing starting material, reagent or products.

begin mathsize 16px style bold C subscript bold 6 bold H subscript bold 5 bold CHO bold space bold plus bold space bold CH subscript bold 3 bold CH subscript bold 2 bold CHO bold space bold rightwards arrow from bold increment to bold dil bold. bold NaOH of end style

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260. Complete each synthesis by giving missing starting material, reagent or products.

space CH subscript 3 COCH subscript 2 COOC subscript 2 straight H subscript 5 space rightwards arrow from left parenthesis ii right parenthesis space straight H to the power of plus to left parenthesis straight i right parenthesis space NaBH subscript 4 of

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