which alcohol and carboxylic acid would produce benzyl isobutyrate by Fischer esterification? and which alcohol and carboxylic acid would produce isobutyl benzoate by fischer esterification?

Since this is not my area of expertise, I searched Google under the key words "Fischer esterification" to get these possible sources:

http://www.chemhelper.com/fischester.html
http://en.wikipedia.org/wiki/Fischer_esterification
http://www.organic-chemistry.org/frames.htm?http://www.organic-chemistry.org/namedreactions/fischer-esterification.shtm
http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch19/ch19-3-1-3.html
http://www.chemgapedia.de/vsengine/vlu/vsc/en/ch/12/oc/vlu_organik/c_acid/carbons_und_derivate.vlu/Page/vsc/en/ch/12/oc/c_acid/esterbildung/esterbildung1.vscml.html

You can continue the search using other terms as key words.

I hope this helps. Thanks for asking.

I answered this question for you yesterday.

I apologize for any confusion. Upon reviewing my previous response, it seems that I did not provide a specific answer to your question.

To produce benzyl isobutyrate by Fischer esterification, you would need benzyl alcohol and isobutyric acid. Benzyl alcohol has the structural formula C6H5CH2OH and isobutyric acid has the structural formula (CH3)2CHCOOH.

On the other hand, to produce isobutyl benzoate by Fischer esterification, you would need isobutyl alcohol and benzoic acid. Isobutyl alcohol has the structural formula (CH3)2CHCH2OH and benzoic acid has the structural formula C6H5COOH.

In Fischer esterification, an alcohol reacts with a carboxylic acid in the presence of an acidic catalyst to form an ester. The alcohol provides the -OR group in the ester product, while the carboxylic acid provides the -COOH group. The specific alcohol and carboxylic acid chosen will determine the structure of the resulting ester.

It's important to note that Fischer esterification is an equilibrium reaction, meaning that it does not go to completion. The reaction can be driven forward by removing the water byproduct, for example, using a Dean-Stark trap.

I hope this explanation clarifies the answer to your question. If you have any further inquiries, please don't hesitate to ask.