Minimum carbon atoms are required to form a branched chain hydrocarbon.

three

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four

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five

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six

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Solution

The correct option is B four
To form a branched chain hydrocarbon, principal carbon chain should have at least three carbon atoms. And the smallest possible branch is methyl ( $- {CH}_{3}$ ) which has one carbon atom. Thus, minimum four carbon atoms are required to form a branched chain hydrocarbon.

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