
Concept explainers
Interpretation: The number of hydrogen atoms in the saturated hydrocarbons that contain 23, 25, and 27 carbon atoms is to be calculated.
Concept introduction: The aliphatic hydrocarbons that have only C−C and C−H bonds are called

Answer to Problem 4.1P
The number of H atoms present in the saturated hydrocarbons of sex pheromone that contain 23, 25, and 27 carbon atoms are 48, 52, and 56 respectively.
Explanation of Solution
The given hydrocarbons of sex pheromone are saturated acyclic alkanes.
The aliphatic hydrocarbons that have only C−C and C−H sigma bonds are called alkanes. They are classified as acyclic or cyclic. The acyclic alkanes are known as saturated hydrocarbons.
The general molecular formula of acyclic alkanes is CnH2n+2.
Where,
• n is an integer, that represents number of carbon atoms.
For the hydrocarbon of sex pheromone that contains 23 carbon atoms:
Substitute the value of number of carbon atoms (n) in general molecular formula of acyclic alkanes.
C23H(2×23)+2C23H48
Thus, the molecular formula of hydrocarbon that contains 23 carbon atoms is C23H48.
Hence, the number of hydrogen atoms is 48.
For the hydrocarbon of sex pheromone that contains 25 carbon atoms:
Substitute the value of number of carbon atoms (n) in general molecular formula of acyclic alkanes.
=C25H(2×25)+2=C25H52
Thus, the molecular formula of hydrocarbon that contains 25 carbon atoms is C25H52.
Hence, the number of hydrogen atoms is 52.
For the hydrocarbon of sex pheromone that contains 27 carbon atoms:
Substitute the value of number of carbon atoms (n) in general molecular formula of acyclic alkanes.
=C27H(2×27)+2=C27H56
Thus, the molecular formula of hydrocarbon that contains 27 carbon atoms is C27H56.
Hence, the number of hydrogen atoms is 56.
The number of H atoms in hydrocarbons of sex pheromone that contain 23, 25, and 27 carbon atoms are 48, 52, and 56 respectively.
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