Organic chemistrey

Hello, can someone pls explain me how this answer to the question is A?

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The question seems a bit too difficult for the IMAT.

you can just use an oxidizing agent to substitute OH group to produce an aldehyde. (Na2Cr2O7 can be used).

For E, you need to perform an elimination reaction.

For B, you can’t substitute Br with OH due to differences in electronegativity and potential energy.

For D, again you need to use EtOH to substitute it, but OH is a very bad “leaving group”.

For B and D you can change OH to OTs by using (TsCl, and pyridine) then a substitution reaction, so it actually requires more than one reaction.

For C, I don’t think there is a reaction that could give a carboxylic acid directly from alcohol.

Hope it helps, but don’t worry if you didn’t get it.

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Thanks for your explanation Ari !

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