Select the appropriate reagents for the following transformation.

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Answer 1

Answer #1

Concepts and reason

In the given reaction, a conversion from a carboxylate ion to alcohol is given and the reagent suitable for this conversion needs to be identified among the given choices.

The conversion is an example of example of reduction reaction, therefore, based on the strength of reducing agent identify the correct reducing agent.

Fundamentals

• Oxidation refers to the addition of oxygen to the molecule or removal of hydrogen from the molecule. It can also be explained in terms of electrons transfer. Loss of electron from the molecule refers to oxidation that increases the oxidation number.

Consider the given set of reagents and marked them as oxidizing and reducing as shown below:

Reducing agents are as follows:

• $\begin{array}{l}\\{\rm{1) LiAl}}{{\rm{H}}_{\rm{4}}}\\\\2)\,{\rm{E}}{{\rm{t}}_2}{\rm{O}}\\\\{\rm{3) }}{{\rm{H}}_{\rm{2}}}{\rm{O}}\\\end{array}$

• $\begin{array}{l}\\{\rm{1) NaB}}{{\rm{H}}_{\rm{4}}}\\\\2)\,{{\rm{H}}_{\rm{2}}}{\rm{O}}\\\end{array}$

• ${{\rm{H}}_{\rm{2}}}$

Oxidizing agent

• ${{\rm{K}}_{\rm{2}}}{\rm{C}}{{\rm{r}}_{\rm{2}}}{{\rm{O}}_{\rm{7}}}/{{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}/{\rm{acetone}}$

Consider the given conversion, that is, from carboxylate ion to the alcohol, hence, reduction is taking place and the suitable reagent is as follows:

1) LiAlH
07 2) EOAC
3) HO

Ans:

Hence, the correct reagent is as follows:

1) LiAlH
2) EtOAC
3) H2O
1) NaBH4
2) H.O
1)
H
1) K,Cr,0/H SO / acetone

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Answer 2

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