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Question

Which of the following compound is optically inactive?

A
Propanoic acid
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B
Glyceraldehyde
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C
Lactic acid
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D
Glucose
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Solution

The correct option is A Propanoic acid
Molecules that posses chirality are optically active. Chiral carbon is the one having all different groups attached.
Propanoic acid is: CH3CH2COOH has no chirality thus its optically inactive
Glyceraldehyde:HOCCH(OH)CH2OH has a ciral center thus its optically active
Lactic acid is H3CCH(OH)COOH has a chiral center thus its optically active
Glucose is HOCCH(OH)CH(OH)CH(OH)CH(OH)CH2OH has multiple chiral center thus its optically active
thus option A is correct

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