Answer
A Has 5 chiral carbons.
B has 3 chiral carbons.
C has 1 chiral carbon.
D has 3 chiral carbons
Work Step by Step
A chiral carbon has four different groups bonded to it.
In part a, carbon number 1-5 are all chiral but carbon number 6 is not chiral because two C-H bonds are present.
In part b, carbon number 1 is not chiral because it has double bond and only three different groups attached. Carbon number 2-4 are all chiral. Carbon number 5 is not chiral due to the presence of two C-H bonds.
In part c, only carbon number 3 is chiral. Carbon number 1 and 4 are not chiral due to the presence of two C-H bonds. Carbon number 2 is not chiral due to the presence of a double bond and only 3 different groups bonded to carbon atom.
In part d, carbon number 1-3 are all chiral. Carbon number 4 is not chiral due to the presence of two C-H bonds.
