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Which one of the following statements is correct ?  
[AIEEE-2012]
  • a)
    All amino acids are optically active
  • b)
    All amino acids except glycine are optically active
  • c)
    All amino acids except glutamic acid are optically active
  • d)
    All amino acids except lysine are optically active
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which one of the following statements is correct ?[AIEEE-2012]a)All am...
The simplest member of this group is glycine, where the saturated carbon atom is unsubstituted, rendering it optically inactive. The rest of the 20 most common amino acids are optically active existing as both D and L stereoisomer.
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Which one of the following statements is correct ?[AIEEE-2012]a)All am...
Explanation:

Optical Activity:
Optical activity is the ability of a substance to rotate the plane of polarized light. It is a property exhibited by certain compounds that contain a chiral center, which is an atom that is bonded to four different groups. Amino acids are a type of compound that can exhibit optical activity.

Amino Acids:
Amino acids are organic compounds that are the building blocks of proteins. There are 20 different amino acids that are commonly found in proteins. Each amino acid has an amino group (-NH2), a carboxyl group (-COOH), and a unique side chain (R-group).

Chirality of Amino Acids:
Chirality refers to the property of having a non-superimposable mirror image. In other words, a chiral molecule is one that cannot be superimposed onto its mirror image. Chirality is an important concept in chemistry because chiral molecules often have different physical and chemical properties.

Optical Activity of Amino Acids:
Due to the presence of a chiral center in amino acids, they can exist in two different forms known as enantiomers. Enantiomers are mirror images of each other that cannot be superimposed. These enantiomers are designated as L- and D- forms based on the arrangement of groups around the chiral center.

Glycine:
Glycine is the simplest amino acid that does not possess a chiral center. It has a hydrogen atom as its R-group, which means that it is achiral and does not exhibit optical activity.

Other Amino Acids:
All other amino acids, except glycine, possess a chiral center and therefore exist as a mixture of L- and D- enantiomers. This means that they are optically active and can rotate the plane of polarized light.

Conclusion:
Based on the given options, the correct statement is that all amino acids except glycine are optically active. Glycine is the only amino acid that does not possess a chiral center and therefore does not exhibit optical activity.
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Which one of the following statements is correct ?[AIEEE-2012]a)All am...
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Read the passage given below and answer the following questions:The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.Q. In this questions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.Assertion (

Read the passage given below and answer the following questions:The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.Q. In thisquestions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.Assertion (

Read the passage given below and answer the following questions:The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.Q. In thisquestions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.Assertion (

Read the passage given below and answer the following questions:The objects which are non-superimposable on their mirror image (like a pair of hands) are said to be chiral and this property is known as chirality. Chiral molecules are optically active, while the objects, which are, superimposable on their mirror images are called achiral. These molecules are optically inactive. The above test of molecular chirality can be applied to organic molecules by constructing models and its mirror images or by drawing three dimensional structures and attempting to superimpose them in our minds. There are other aids, however, that can assist us in recognising chiral molecules. One such aid is the presence of a single asymmetric carbon atom.Q. In thisquestions a statement of assertion followed by a statement of reason is given . Choose the correct answer out of the following choices.Assertion (

Which one of the following statements is correct ?[AIEEE-2012]a)All amino acids are optically activeb)All amino acids except glycine are optically activec)All amino acids except glutamic acid are optically actived)All amino acids except lysine are optically activeCorrect answer is option 'B'. Can you explain this answer?
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