Question:
Which from following amino acids does NOT contain chiral carbon?
Which from following amino acids does NOT contain chiral carbon?
Show Hint
Glycine has two hydrogens on its alpha carbon, so it is not chiral.
Updated On: Oct 1, 2026
- Valine
- Alanine
- Glycine
- Isoleucine
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
A chiral carbon is bonded to four different groups.
Step 2: Detailed Explanation
The alpha carbon of an amino acid carries NH\(_2\), COOH, H and the side chain R.
In glycine, R is H, so the alpha carbon has two identical H atoms and is not chiral.
Valine, alanine and isoleucine have different R groups (isopropyl, methyl, sec-butyl), so their alpha carbons are chiral. Isoleucine has one more chiral carbon in its side chain.
Final Answer:
Glycine contains no chiral carbon, option (C). \[ \boxed{\text{Glycine (C)}} \]
A chiral carbon is bonded to four different groups.
Step 2: Detailed Explanation
The alpha carbon of an amino acid carries NH\(_2\), COOH, H and the side chain R.
In glycine, R is H, so the alpha carbon has two identical H atoms and is not chiral.
Valine, alanine and isoleucine have different R groups (isopropyl, methyl, sec-butyl), so their alpha carbons are chiral. Isoleucine has one more chiral carbon in its side chain.
Final Answer:
Glycine contains no chiral carbon, option (C). \[ \boxed{\text{Glycine (C)}} \]
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