Mention at least two simple chemical tests by which you can distinguish between benzaldehyde and benzoic acid.

Question

Accepted Answer

Welcome everybody. Our next problem says, provide two simple chemical tests that will differentiate acid aldehyde and acetic acid. And our answer choices all involve two different tests. A P test indicating that one has a ph of one type, the other has a ph of another and two Tollins tests whether the compound reacts or does not. So first, let's look at which compounds are we dealing with? These are common names. Acid aldehyde is a two carbon aldehyde. So it has CH three and then our carbon carbon, its an aldehyde. So then theres a hydrogen acetic acid is the fully oxidized version of this. So it has that ch three, the carbonyl carbon and then instead of a hydrogen, it has an oh group. So our two tests, of course, one is what is the ph of this compound? The other is the Tollins test. So we were called the Tolins test produces a silver precipitate when it reacts with an aldehyde or more correctly. I should say it produces a silver and I have a quotation marks mirror when it reacts with aldehyde intolerance tests, you have silver oxide that reacts with the aldehyde. The aldehyde is oxidized to a carboxylic acid. The silver oxide is reduced to produce metallic silver that coats the flask to produce the silver mirror. So, with that in mind, let's think about our two compounds. Well, only one isn't aldehyde, that's acid aldehyde. So, acid aldehyde will react with Tollins. Put tolins, there were tolins over the acid aldehyde and the acetic acid will not. So we'll put no tolins over acetic acid. And in terms of the Ph Test, you have it right in the name acetic acid is obviously acidic and will have a low ph acid aldehyde is relatively neutral. So let's look through our answer. Choices to see what reflects that choice. A says number one Ph Test acid aldehyde is strongly basic. So this is incorrect as it is neutral while acetic acid is acidic. Well, that part is correct, but we don't even need to go further because we've caused number one to be incorrect right away. So choice A can be eliminated for choice B it says number one, Ph Test acid aldehyde is relatively neutral. So that is correct. So ph about seven while acetic acid is acidic, ph greater than seven. Well, this is incorrect because an acidic compound will have a ph less than seven. So eliminate choice B choice C says number one Ph Test acid aldehyde is strongly basic. So again, that's incorrect since it's neutral. So choice C can be eliminated. Choice D says number one, Ph test acid aldehyde is relatively neutral ph about seven. While acetic acid is acidic, ph less than seven. So, number one is correct. Well, we're obviously down to just choice D. So we hope this is correct. Number two tins test acid aldehyde reacts with tin's reagent to produce a silver precipitate while acetic acid does not react. So this is correct as well. So choice D is our correct answer. The two simple chemical tests that will differentiate between acid aldehyde and acetic acid. Number one, the Ph test acid aldehyde is relatively neutral. While acetic acid is acidic. Number two tolins test acid aldehyde reacts with tolins reagent to produce a silver precipitate. While acetic acid does not react. See you in the next video.

Mention at least two simple chemical tests by which you can distinguish between benzaldehyde and benzoic acid.

Verified video answer for a similar problem:

Key Concepts

Functional Groups

Chemical Tests

Solubility and pH