The total number of chiral molecules formed from one molecule of $P$ on complete ozonolysis $\left( O _3, Zn / H _2 O \right)$ is_____
Correct Answer: 2
Approach Solution - 1
Only 2 chiral molecules are formed.
Approach Solution -2
1. Understanding Ozonolysis:
Ozonolysis is a reaction where an alkene undergoes cleavage in the presence of ozone (\( \text{O}_3 \)) and is typically followed by reduction with zinc (Zn) and water (\( \text{H}_2\text{O} \)). This reaction results in the formation of two carbonyl compounds (typically aldehydes or ketones) from the original double bond.
2. Analyzing the Structure of \( P \):
The molecule shown contains a double bond, and upon ozonolysis, this double bond will break, forming two products. Since the molecule is symmetrical, it will form two identical products after the cleavage of the double bond.
3. Chiral Centers:
After ozonolysis, each of the two products will have a chiral center formed at the carbon atoms that were originally part of the double bond. The formation of a chiral center indicates that the molecule is asymmetrical around that point, making it chiral.
4. Counting the Chiral Molecules:
Since the reaction produces two identical products with chiral centers, the total number of chiral molecules formed from one molecule of \( P \) is 2.
Final Answer:
The total number of chiral molecules formed from one molecule of \( P \) on complete ozonolysis is 2.
Top Questions on Ozonolysis
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Concepts Used:
Hydrocarbons - Reaction Mechanism
Hydrocarbons are organic compounds that are entirely made up of only two kinds of atoms – carbon and hydrogen. Typically, hydrocarbons are colourless gases that have very weak odours.
Mechanism of electrophilic substitution reactions:
According to experimental evidences, SE (S = substitution; E = electrophilic) reactions are supposed to proceed via the following three steps:
- Generation of the electrophile
- Formation of carbocation intermediate
- Removal of proton from the carbocation interm
Hydrocarbons - Classification
Types of Hydrocarbons:
Hydrocarbons are classified under the special heads as stated below:
Saturated hydrocarbons-
Those compounds where there is a single bond present between carbon atoms and are saturated with atoms of hydrogen are saturated hydrocarbons. They are the prime component of petroleum fuel. Carbon atoms bond themselves to as many hydrogen atoms as they can. They undergo the process of hybridization, and also, do not have double or triple bonds. The formula for alkanes which is the most common hydrocarbon is CnH2n+2. Saturated hydrocarbons have an akin molecular formula as hydrocarbons.
Unsaturated hydrocarbons-
Hydrocarbons comprise at least one double or triple bond between carbon atoms known as unsaturated hydrocarbons. Alkenes are organic compounds that comprise double bonds, whereas alkynes are triple bonded. Here, the situation is the opposite of saturated hydrocarbons as the carbon atoms don't bond themselves with as many hydrogen atoms as possible. When it comes to hydrogen atoms, they are unsaturated.
Aliphatic hydrocarbons-
The term denotes the hydrocarbons formed as a result of the chemical degradation of fats. Aliphatic hydrocarbons are generally chemical compounds. Their structure includes one or more hydrogen atoms which are replaced with a halogen. They are linked in chains in single, double, or triple bonds without any rings. Propane, butane, methane, and ethane serve as good examples of aliphatic hydrocarbons.
Aromatic hydrocarbons-
They are discriminated against because of the benzene rings present in them. They give away different types of aroma. These hydrocarbons comprise only hydrogen and carbon atoms. They are used extensively in fields of medicine, hygiene, and fashion.
Hydrocarbons
Hydrocarbons can be described as organic compounds that consists only hydrogen and carbon atoms. These compounds are of different types and thereby have distinct natures. Hydrocarbons are colorless gases and are known for discharging faint odours. These have been categorized under four major classes named as alkynes, alkanes, alkenes, and aromatic hydrocarbons.
Types of Hydrocarbons
- Saturated hydrocarbons - Saturated hydrocarbons are those compounds where there is a single bond exists between carbon atoms and are saturated with atoms of hydrogen.
- Unsaturated hydrocarbons - Hydrocarbons comprises of at least one double or triple bond between carbon atoms are known as unsaturated hydrocarbons.
- Aliphatic hydrocarbons - The term denotes the hydrocarbons formed as an outcome of the chemical degradation of fats. Aliphatic hydrocarbons are basically chemical compounds.
- Aromatic hydrocarbons - They are distinguished because of the presence of benzene rings in them. They give away distinct types of aroma. These hydrocarbons comprises of only hydrogen and carbon atoms.