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What is the lowest molecular mass alkane that is chiral? Is there another alkane of the same molecular formula which is also chiral? If so, then give its structure also.

Answer»

Solution :The lowest molecular mass alkane which is chiral must have a chiral CARBON which is attached to four DIFFERENT atoms/groups of lowest molecular mass, i.e., H, `CH_(3),CH_(3)CH_(2) and CH_(3)CH_(2)CH_(2)`. THEREFORE, the alkane is 3-methylhexane.
Since the isomeric form of n-propyl group is isopropyl group, therefore, another alkane which is chiral is 2,3-dimethylpentane.
`UNDERSET("3-Methylhexane")(CH_(3)CH_(2)-overset(CH_(3))overset(|)(.^(**)C)H-CH_(2)CH_(2)CH_(3))""underset("2,3-Dimethylpentane")(CH_(3)CH_(2)-overset(CH_(3))overset(|)(.^(**)C)H-overset(CH_(3))overset(|)(C)H-CH_(3))`


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