Can you please explain how to chooose the best reagent for numbers 5 and 6? I kn

Question

Can you please explain how to chooose the best reagent for numbers 5 and 6? I know the answer, but I do not know how to get to the answer. Thanks

Narrative 8-6 - Choose the best reagent(s) for carrying out the following conversions from the list provided below. Place the letter of the best choice in the blank to the left of the conversion. Reagents may be used more than once. a. CrO3, H2SO4, H2O b. 1. NaBH4, ethanol 2. H3O* c. 1. LiAl4, ether 2. H3O* d. 1. PCC, CH2Clb 2. H3O 5. Refer to Narrative 8-6. OH OH 6. Refer to Narrative 8-6. O H 0 H OH

Explanation / Answer

5) The reagent is CrO3, H2SO4, H2O

Explanation: oxidation of primary alcohol to caboxylic acid is done by a strong oxidising agent. Among the given reagents, CrO3, H2SO4, H2O is the strong oxidising agent and oxidises primary alcohol to carboxylic acid.

6) The reagent is 1) NaBH4, ethanol 2) H3O+

Explanation: Reduction of ketone in presence of carboxylic acid group selectively done by a mild reducing agent NaBH4, ethanol , H3O+.

LiAlH4 is a strong reducing agent and reduces carboxylic acid group also.

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