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JEE Main levelOne or more correct optionsDifficulty 2 of 3bm071

Which statements about glycine are correct? (For the pI statement, use pI = mean of $p K_{a 1} = 2.34$ and $p K_{a 2} = 9.60$ .)

AIt is optically inactive.
BIn the solid state it exists as $H X_{3} N X^{+} - CH X_{2} - COO X^{-}$ .
CIts pI is 5.97.
DIt exists as separable D and L enantiomers.

Answer: A, B, C

Glycine has no stereocentre, so it is achiral and has no D/L enantiomers. The crystal is made of zwitterions. pI =

(2.34 + 9.60) /2 = 5.97

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