Q3 V3Which molecule possess a chiral centre?

Question

BlackTom AI · Accepted Answer

To determine which molecule has a chiral centre, we examine the carbon atoms to see if any one carbon is bonded to four different groups.
Option a: CH2CHNH2. The carbon in question is CH2, which has two hydrogens attached, so it cannot be a chiral centre. Therefore this molecule cannot have a chiral centre at that position.
Option b: CH2(NH2)COOH. This structure corresponds to glycine, where the central carbon is CH2 bonded to NH2 and COOH but also to two hydrogens. With two identical substituents (two hydrogens), that carbon is not stereogenic, so no chiral centre here.
Option c: CH3CH(NH2)COOH. This is an alanine-like structure where the second carbon (the one bearing NH2) is bonded to four different groups: a methyl group (CH3), an amino group (NH2), a carboxyl group (COOH), and a hydrogen (implied). Since all four substituents are distinct, this carbon is a chiral centre, making the molecule chiral.
Option d: CH3CH(NH2)CH3. Here the second carbon bears NH2, but its other substituents are two methyl groups (both CH3) on either side, which are identical. A carbon with two identical groups cannot be a stereocentre, so this molecule is not chiral.
In summary, only option c presents a carbon atom bonded to four different substituents, satisfying the definition of a chiral centre, while the other options fail that criterion for various reasons.

Q3 V3Which molecule possess a chiral centre?单项选择题

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