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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm082

Which statements about the amino acid threonine, $CH X_{3} - CH (OH) - CH (NH X_{2}) - COOH$ , are correct?

AL-Threonine and D-Threonine are enantiomers.
BIt has eight stereoisomers.
CIt has two stereocentres.
DIt is a non-essential amino acid.

Answer: A, C

Threonine has two unlike stereocentres, giving

2^{2} = 4

stereoisomers (not 8), and the D- and L-forms are mirror images. Threonine is one of the ten essential amino acids, so the non-essential statement is false.

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