The molecular mass of a hydrocarbon is 70 . The number of possible acyclic structural isomers is

Name: Problem 156, Chapter 23: A Complete Resource Book in Chemistry for JEE Main
Uploaded: 2021-10-21T16:38:34-08:00
Duration: 1 min 34 s
Channel: Alkendra Singh
Description: The molecular mass of a hydrocarbon is 70 . The number of possible acyclic structural isomers is

step 1 The question is how many structural and geometrical isomers are possible for the dimethyl cyclic

The molecular mass of a hydrocarbon is 70 . The number of...

Key Concepts

Hydrocarbons

Hydrocarbons are organic compounds composed exclusively of carbon and hydrogen atoms. They form a fundamental class of organic molecules and can be categorized into different types, including alkanes, alkenes, and alkynes, each characterized by the types of bonds between carbon atoms. Understanding the general behavior and bonding patterns in hydrocarbons is essential in organic chemistry as it influences molecular structure and reactivity.

Molecular Mass Calculation

Molecular mass is the sum of the atomic masses of all the atoms in a molecule. In organic compounds, determining the molecular mass helps in deducing the possible molecular formulas once the constituent elements (typically carbon and hydrogen in hydrocarbons) are considered. This calculation is critical in bridging between experimental data and the theoretical structural possibilities of a compound.

Structural Isomerism

Structural isomerism refers to the phenomenon where compounds share the same molecular formula but differ in the connectivity or arrangement of atoms. This variation leads to different physical and chemical properties despite having the same number of each type of atom. In the context of acyclic hydrocarbons, different arrangements of the carbon skeleton (including branching) are considered, thereby increasing the number of possible isomers.

Acyclic Compounds

Acyclic compounds are organic molecules in which the atoms are connected in an open-chain structure without forming rings. The restriction to acyclic structures simplifies the isomer enumeration by excluding cyclic or ring-forming possibilities. This concept is significant when counting structural isomers under the constraint that the molecules do not contain rings or cyclic functional groups.

Degree of Unsaturation

The degree of unsaturation (or index of hydrogen deficiency) is a measure of the total number of rings and multiple bonds in a molecule. It provides insight into the presence of double bonds, triple bonds, or rings based on the molecular formula. Understanding the unsaturation level is crucial in narrowing down the structural possibilities of a hydrocarbon, especially when deducing potential isomers from a given molecular mass.

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