Answer
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Hint: For answering this question we should learn about Optical activity and Chirality of organic compounds. We will discuss both processes and structure of Citric acid in detail to decide whether it is optically active or not.
Complete answer:
Optical activity of an organic compound tells us about the property of organic compounds by which the organic compound rotates the plane-polarized light when it is passed through the solution of the organic compound. These compounds are called Optically active compounds.
Optical activity has two types
Dextrorotatory: It means rotation to the right. If the organic compound rotates the light to the right side or in clockwise direction it is known as dextrorotatory. It is represented by adding a $ ( + ) $ sign before the degree of rotation.
Laevorotatory: It means rotation to the left. If the organic compound rotates the plane polarised light to the left side or in anticlockwise direction it is known as laevorotatory. It is represented by adding a $ ( - ) $ sign before degree of rotation
Chirality
A structure which is asymmetric and non-superimposable over its mirror image is known as chiral or stereocenter. This property of compound is known as chirality.
Both above mentioned properties are required for a compound to be optically active.
Let' see the structure of Citric acid
From above structure we can see the Citric acid does not contain a chiral carbon and does not show any stereoisomerism so it is optically inactive.
Note:
Citric acid appears to be a colourless and odourless crystals with taste like an acid. It is denser than water. It is generally present in citrus fruits Oranges and lemons. Citrus acid is used as a food acidity regulator.
Complete answer:
Optical activity of an organic compound tells us about the property of organic compounds by which the organic compound rotates the plane-polarized light when it is passed through the solution of the organic compound. These compounds are called Optically active compounds.
Optical activity has two types
Dextrorotatory: It means rotation to the right. If the organic compound rotates the light to the right side or in clockwise direction it is known as dextrorotatory. It is represented by adding a $ ( + ) $ sign before the degree of rotation.
Laevorotatory: It means rotation to the left. If the organic compound rotates the plane polarised light to the left side or in anticlockwise direction it is known as laevorotatory. It is represented by adding a $ ( - ) $ sign before degree of rotation
Chirality
A structure which is asymmetric and non-superimposable over its mirror image is known as chiral or stereocenter. This property of compound is known as chirality.
Both above mentioned properties are required for a compound to be optically active.
Let' see the structure of Citric acid
From above structure we can see the Citric acid does not contain a chiral carbon and does not show any stereoisomerism so it is optically inactive.
Note:
Citric acid appears to be a colourless and odourless crystals with taste like an acid. It is denser than water. It is generally present in citrus fruits Oranges and lemons. Citrus acid is used as a food acidity regulator.
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