The number of chiral centres present in threonine is .

Question

The number of chiral centres present in threonine is  .

Canvas Classes · Accepted Answer

Structure of Threonine (Thr, T):

Threonine is an -amino acid with the structure:

Identifying chiral centres:

| Carbon | Groups attached | Chiral? |
|---|---|---|
| C1 (–COOH) | =O, –OH, C2 | No (sp² carbon) |
| C2 (-carbon) | –NH₂, –H, –COOH, –CH(OH)CH₃ | Yes ✓ |
| C3 | –OH, –H, –CH₃, –CH(NH₂)COOH | Yes ✓ |
| C4 (–CH₃) | 3H, C3 | No |

Threonine has 2 chiral centres (C2 and C3), giving 4 possible stereoisomers (2² = 4). The naturally occurring form is L-threonine (2S,3R).

Final Answer: 2

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