What does the Hammett substituent constant (\sigma) measure

Correct Answer is : The electronic effect of a substituent

The steric effect of a substituent

The electronic effect of a substituent

The hydrophobic effect of a substituent

The effect on {\pH} of a substituent

Graduate Pharmacy Aptitude Test (GPAT) 2013 Solved Paper

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What does the Hammett substituent constant (σ) measure

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