Stereoisomerism Trick Question 🔥 | Identify the Chiral Compound in Seconds

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Correct Answer: (d) 2-methylbutanoic acid
Explanation (short & clear):
Stereoisomerism (optical isomerism) requires a chiral carbon (C attached to 4 different groups).
(a) 2-methylbutene-1 → No chiral center
(b) 3-methylbutyne-1 → No chiral center
(c) 3-methylbutanoic acid → No chiral center (two same groups)
(d) 2-methylbutanoic acid → Has chiral carbon (4 different groups) ✅
👉 Hence, only (d) shows stereoisomerism.

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