An organic compound C4 H8 O is found to be optically active. Which of the following is correct s

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An organic compound C4 H8 O is found to be optically active....

An organic compound $\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}$ is found to be optically active. Which of the following is correct structure of the given compound? (a) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCHO}$ (b) $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$ (c) $\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{3}$ (d) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$

An organic compound $\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}$ is found to be optically active. Which of the following is correct structure of the given compound?
(a) $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCHO}$
(b) $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{3}$
(c) $\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{3}$
(d) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CHO}$

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Key Concepts

Molecular Formula and Degrees of Unsaturation

The molecular formula indicates the overall count of atoms and suggests the number of rings or multiple bonds present. Analyzing the formula in relation to its degree of unsaturation allows for exploration of possible structural configurations such as aldehydes, ketones, or alcohols that conform to the given composition.

Optical Activity and Chirality

Optical activity is a property arising from chirality, meaning the compound contains at least one carbon atom with four different substituents (a chiral center). This concept is central to differentiating isomers that are non-superimposable mirror images; only compounds with such a center can be optically active.

Structural Isomerism

Structural isomerism involves compounds that share the same molecular formula but have different connectivity of atoms. In this context, evaluating each isomer’s connectivity is vital in determining which structure can possess a chiral center, resulting in optical activity.

Chiral Center (Asymmetric Carbon)

A chiral center, or asymmetric carbon, is a carbon atom bonded to four distinct groups, leading to non-superimposable mirror images. Recognizing the presence or absence of such a center in different structures is essential for predicting whether an organic compound will be optically active.

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