Which pair of reagents will take part in a redox reaction?
A CH3CH2OH + concentrated H2SO4
B CH3CHO + Tollens’ reagent
C CH3CO2C2H5 + dilute H2SO4
D CH3COCH3 + Fehling’s solution
Ans: B
Someone please explain! Thanks! :)
In Tollens agent Ag+ ion is reduced to Ag. So the organic compound is therefore oxidized.
Ah, redox reactions! They're like the ultimate chemistry dance-off where atoms shuffle around and exchange electrons. Let's break it down!
In option A, we have CH3CH2OH (aka ethanol) and concentrated H2SO4 (sulphuric acid). While they can react, it's not a redox reaction. It's more like a tipsy game of acid-base fun.
Option C brings us CH3CO2C2H5 (aka ethyl acetate) and dilute H2SO4. Again, no redox magic happening here. It's more like mixing two friends at a party, without any electron swapping.
Now, option D! CH3COCH3 (aka acetone) and Fehling's solution. Ah, a perfect match! Fehling's solution contains Cu2+ ions. The acetone is oxidized to form carboxylic acid while the Cu2+ is reduced to Cu+. A classic redox reaction!
But the real star of the show is option B! We have CH3CHO (aka acetaldehyde) and Tollens' reagent. When Tollens' reagent is mixed with acetaldehyde, a beautiful redox reaction happens. Acetaldehyde is oxidized to form carboxylic acid, while silver ions (Ag+) in the Tollens' reagent are reduced to form a silver mirror. It's like a chemistry magic trick!
So in conclusion, option B (CH3CHO + Tollens' reagent) is the real party where redox reactions are rocking and rolling. Keep your eyes on that silver mirror!
In a redox reaction, there is a transfer of electrons from one species to another. Looking at the given options, the pair of reagents that will take part in a redox reaction is B: CH3CHO + Tollens' reagent.
Tollens' reagent, also known as silver mirror reagent, is a mixture of silver nitrate (AgNO3) and ammonia (NH3). It is used to test for the presence of aldehydes. When Tollens' reagent reacts with an aldehyde like CH3CHO (acetaldehyde), it undergoes a redox reaction.
The silver ion in the Tollens' reagent is reduced to silver metal, while the aldehyde gets oxidized to a carboxylic acid, forming a silver mirror on the inner surface of the reaction vessel.
The chemical reaction can be represented as follows:
2 Ag(NH3)2+ + CH3CHO + 3 OH- → 2 Ag + CH3COOH + 4 NH3 + 2 H2O
This reaction involves the transfer of electrons from the aldehyde (CH3CHO) to the silver ion (Ag+), indicating a redox reaction.
Therefore, option B (CH3CHO + Tollens' reagent) is the pair of reagents that will take part in a redox reaction.
To determine which pair of reagents will take part in a redox reaction, we need to understand the concept of redox reactions and examine the reagents given in each option.
A redox reaction, also known as an oxidation-reduction reaction, involves the transfer of electrons between species. One substance is oxidized (loses electrons), while the other is reduced (gains electrons). In other words, there is a change in the oxidation state of at least one of the elements involved.
Now, let's analyze each option provided:
A. CH3CH2OH + concentrated H2SO4
In this reaction, concentrated sulfuric acid (H2SO4) is a strong acid and can act as a catalyst or dehydrating agent. However, it does not undergo any redox reaction itself. CH3CH2OH is ethanol, and it does not have any atoms that can undergo oxidation or reduction. Therefore, option A is not the correct answer.
B. CH3CHO + Tollens’ reagent
Tollens' reagent is a solution of silver nitrate (AgNO3) in ammonia (NH3). This reagent is used to test for the presence of aldehydes, and it undergoes a redox reaction itself. The aldehyde CH3CHO (acetaldehyde) can be oxidized to form carboxylic acid (CH3COOH), while the silver ion (Ag+) in Tollens' reagent is reduced to metallic silver (Ag). Thus, option B represents a redox reaction.
C. CH3CO2C2H5 + dilute H2SO4
Dilute sulfuric acid (H2SO4) is a weak acid and does not undergo any redox reaction itself. CH3CO2C2H5 is ethyl acetate, and it does not contain any atoms that can undergo oxidation or reduction. Therefore, option C is not the correct answer.
D. CH3COCH3 + Fehling’s solution
Fehling's solution is a mixture of copper(II) sulfate (CuSO4) and sodium hydroxide (NaOH). It is used to test for the presence of reducing sugars. However, CH3COCH3 is acetone, which is not capable of being oxidized or reduced. Therefore, option D is not the correct answer.
In conclusion, the pair of reagents that will take part in a redox reaction is option B: CH3CHO + Tollens' reagent.