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21. Give the IUPAC names of the following compounds:

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22. Show how each of following compounds could be converted to benzoic acid.
Ethylbenzene.

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23. Show how each of following compounds could be converted to benzoic acid.
Acetophenone.

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24. Show how each of following compounds could be converted to benzoic acid.
Bromobenzene.

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25. Show how each of following compounds could be converted to benzoic acid.
Phenylethene (styrene)

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26. Which acid of each pair shown here would you expect to be stronger?
CH₂FCOOH or CH₂ClCOOH

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27. Which acid of each pair shown here would you expect to be stronger?
CH₂FCH₂CH₂COOH or CH₃CHFCH₂COOH

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28. Which acid of each pair shown here would you expect to be stronger?

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29. Give the IUPAC names of

CH subscript 3 CHO

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30. Give the IUPAC names of

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