Essays on Aldehyde

Introduction

Reduction reactions are very important in chemistry as they are effective processes for synthesizing new compounds from existing ones. In organic chemistry, a compound is said to be reduced if it acquires new hydrogen. There are diverse reagents for carrying our reduction reactions. Two of these are sodium borohydride (NaBH4) and lithium aluminum hydride (LiAlH4) - the latter is a more powerful reducing agent compared to the former. In this experiment, NaBH4 was used to reduce p-Nitrobenzaldehyde to form p-Nitrobenzyl alcohol. NaBH4was used over LiAlH4 in this experiment, because LiAlH4 would also reduce the nitro group of the aldehyde.

Experimental:

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The aim of the experiment was to identify the functional group of the two unknown organic compounds.

Method

Step 1: Test for acidity and basicity of the unknown by a universal indicator Step 2: Test for the capacity of the unknown to be oxidized by KMnO4 Step 3: Test for the capacity of the unknown to be reduced by a Tollen reagent Step 4: Test for the presence of a carbonyl group in the unknown using 2, 4-DNP Step 5: Test for the presence of an alcohol group in ...

Abstract

The purpose of this experiment was to characterize aldehydes and ketones using Tollen’s test and Iodoform test. It also aims to identify an unknown substance as well as determine whether glucose is an aldehyde or a ketone using the same tests. In order to achive these purposes, four test tubes where prepared for each type of test. For Tollen’s test, each of the tubes contained 1 drop of the analyte to which 1mL of the Tollen’s reagent was added. For the Idoform test, 4 drops of each substance was used, to which 2 mL of sodium hydroxide ( ...

Lab Report on Aldehydes and Ketones Experiment

Lab Report on Aldehydes and Ketones Experiment

The current experiment aimed at learning properties of some of the common aldehydes and ketones, as well as, the chemical tests used to distinguish the different classes. Both aldehydes and ketones have the same functional group known as carbonyl group C=O. In the aldehyde compounds, the carbonyl group is located at the end the structure with a general structure shown below (McNaught & Wilkinson, 1997). The carbonyl carbon is, therefore, the first carbon of the carbon chain. On the other hand, the carbonyl group in ketones is located anywhere on the carbon ...

1. What happens to glucose or galactose when the Cu2 in Benedict’s is reduced? The glucose and galactose both monosaccharaides are oxidized. The cyclic structures of both sugars are opened resorting to an aldehyde group at the end of the aliphatic compound. The aldehyde group is the one that reduces benedict’s solution and oxidizes the sugars. 2. Would you expect fructose or glucose to form a red color rapidly with Seliwanoff’s reagent? Fructose is a ketose therefore, a deep red color will form quickly with Seliwanoff reagent, while glucose an aldose with form a light pink color ...