
Concept explainers
Neopheliosyne B is a novel acetylenic fatty acid isolated from a New Caledonian marine sponge. (a) Label the most acidic H atom. (b) Which carbon-carbon

(a)
Interpretation: The most acidic H atom present in nepheliosyne B is to be labeled.
Concept introduction: The most acidic hydrogen
Answer to Problem 11.1P
The labeling of the most acidic H-atom present in nepheliosyne B is shown below.
Explanation of Solution
The labeling of most acidic H-atom is shown as,
Figure 1
The stability of conjugate base of carboxylic acid is more than the stability of alcohol’s conjugate base. Thus, the acidity of hydrogen atom present in the carboxylic acid is more than that of alcohol because resonance stabilized conjugate base results in an increase in the acidity of a compound.
The labeling of most acidic H-atom present in nepheliosyne B is shown in Figure 1.

(b)
Interpretation: The shortest carbon-carbon
Concept introduction: The higher value of s-character corresponds to the higher electronegativity and lesser bond strength The highly electronegative carbon that is
Answer to Problem 11.1P
The shortest carbon-carbon
Explanation of Solution
The carbon-carbon
Figure 2
The bond (a) in the given compound is formed by
The shortest carbon-carbon

(c)
Interpretation: The number of degree of unsaturation contained by nepheliosyne B is to be stated.
Concept introduction: The degree of unsaturation states the total number of double bonds, triple bonds or rings present in a compound. It is calculated by the molecular formula of compound containing carbon and hydrogen atom.
Answer to Problem 11.1P
There are total
Explanation of Solution
The molecular formula of nepheliosyne B is given by,
Where
•
Substitute the value of
As the molecular formula of compound contains
The degree of unstauration is calculated by the formula,
Hence, the total number of degree of unstauration present in nepheliosyne B is
The total number of degree of unstauration present in nepheliosyne B is

(d)
Interpretation: The number of bonds formed by
Concept introduction: The procedure of intermixing of the atomic orbitals in an atom is known hybridization. This intermixing of the atomic orbitals is used to form a set of new atomic orbital with different geometry.
Answer to Problem 11.1P
The number of bonds formed by
Explanation of Solution
The number of bonds formed by
Figure 3
Thus, there are six bonds formed by
The total number of bonds formed by

(e)
Interpretation: Each of the triple bond present in nepheliosyne B is to be labeled as internal or terminal.
Concept introduction: The triple bond or alkyne which contains carbon substituents over acetylenic carbon is known as internal triple bond or alkyne. In case of terminal triple bond or alkyne, there is at least one acetylenic carbon that contains H-atom linked to it.
Answer to Problem 11.1P
The labeling of the triple bonds present in nepheliosyne B as internal or terminal is shown as,
Explanation of Solution
The labeling of the triple bonds present in nepheliosyne B as internal or terminal is shown as,
Figure 4
In Figure 4, there are three internal triple bonds and one terminal triple bond present.
The labeling of the triple bonds present in nepheliosyne B as internal or terminal is shown in Figure 4.
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