1.

Which of the following atoms can be a chiral center in a given molecular species? (i) Carbon (ii) Nitrogen (iii) Phosphorus (iv) Silicon

Answer»

(i),(ii),(iii),(IV)
(ii),(iii),(iv)
(iii),(iv)
Only (i)

Solution :A chiral center is an atom bonded tetrahedrally to four different atoms or groups of atoms (ligands).A chiral center is usually a `C` atom but may be `N,P,SI,` etc.
EXAMPLE of `C,Si` and `P` serving as chiral centers (stereocenters) are:
`H_(2)C=CH-underset(Br)underset(|)OVERSET(H)overset(|)(C^(**))-CH_(2)CH_(3)`
`CH_(3)CH_(2)-.^**underset(CI)underset(|)overset(CH_(3))overset(|)(Si)-CH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)-overset(CH_(3))underset(underset(..)(overset(-)overset(.).Ooverset(.).))underset(|)overset(+|**)(N)-CH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)-overset(CH_(3))overset(+|**)underset(H)underset(|)(P)-CH_(2)CH_(2)CH_(3)`


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