Question:
The compound(s) showing optical activity is/are
The compound(s) showing optical activity is/are
Show Hint
Optical activity checklist:
- Four different groups on carbon \( \Rightarrow \) chiral
- Check for meso symmetry
- Multiple chiral centers \( \neq \) always optically active
Updated On: Mar 2, 2026
- Option a
- Option b
- Option c
- Option d
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The Correct Option is B
Solution and Explanation
Concept:
A compound is optically active if:
Central carbon has: \[ \text{COOH, NH}_2, H, H \] Two identical substituents (H, H) ⇒ achiral. Not optically active.
(B)
Central carbon attached to: \[ \text{COOH, OH, CH}_3, H \] All four substituents different ⇒ chiral center present. Optically active.
(C)
Structure resembles glyceraldehyde type: \[ \text{CHO, OH, CH}_2\text{OH, H} \] Four different groups around carbon ⇒ chiral. Optically active.
(D)
Contains two stereocenters but has an internal plane of symmetry (meso compound). Thus optically inactive.
Conclusion:
Optically active compounds: B and C.
- It has at least one chiral center
- It has no internal plane of symmetry (no meso form)
Central carbon has: \[ \text{COOH, NH}_2, H, H \] Two identical substituents (H, H) ⇒ achiral. Not optically active.
(B)
Central carbon attached to: \[ \text{COOH, OH, CH}_3, H \] All four substituents different ⇒ chiral center present. Optically active.
(C)
Structure resembles glyceraldehyde type: \[ \text{CHO, OH, CH}_2\text{OH, H} \] Four different groups around carbon ⇒ chiral. Optically active.
(D)
Contains two stereocenters but has an internal plane of symmetry (meso compound). Thus optically inactive.
Conclusion:
Optically active compounds: B and C.
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