Question

A hydrocarbon should have minimum how many carbon atoms to show isomerism?
(a) Three
(b) Four
(c) Five
(d) Six​

Answer 1

Answer: Minimum Four Carbon atoms.

Therefore, isomerism starts from butane molecule.

Answer 2

Option (b) four is the correct option:

A hydrocarbon should have a minimum of four carbon atoms to show isomerism.

• When there are four carbon atoms, one can be placed in the middle and two at the ends and the other at the middle or end as well. Since there are multiple ways of placing it, it shows isomerism.
• If there is only one carbon atom – If the alkane contains only one carbon atom, then it cannot form a chain.
• If there are two carbon atoms – When an alkane contains two chains, it does have the ability to form a chain but there is only a single way of doing so. Therefore it does not show isomerism.
• If there are three carbon atoms – This option is to have only one method of forming a chain. One carbon atom will be in the middle and the other two will be at the ends.

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