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Which of the following pentanes has only...

Which of the following pentanes has only mary hydrogen atoms? ltbr? (i) `n`-pentane , (ii) Isopentane
(iii) Neopentane
Strategy: Write down the structure of every alkane. The presence of `1^(@)H` atoms is indicated by the presence of `CH_(3)` groups, `CH_(2)` units contain `2^(@) H` atoms, and `CH` units consits of a `3^(@) H` atom.

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