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(B) Step $1$: Identify the possible structures for the molecular formula $C_4H_{10}O$. This formula corresponds to saturated alcohols or ethers. We ar

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$2$

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(B) Step $1$: Identify the possible structures for the molecular formula $C_4H_{10}O$. This formula corresponds to saturated alcohols or ethers. We are looking for primary alcohols $(R-CH_2OH)$.Step $2$: Draw the isomers:$(i)$ $CH_3-CH_2-CH_2-CH_2OH$ (Butan$-1-$ol) - This is a primary alcohol.(ii) $(CH_3)_2CH-CH_2OH$ ($2$-Methylpropan$-1-$ol) - This is a primary alcohol.(iii) $CH_3-CH_2-CH(OH)-CH_3$ (Butan$-2-$ol) - This is a secondary alcohol.(iv) $(CH_3)_3C-OH$ ($2$-Methylpropan$-2-$ol) - This is a tertiary alcohol.Step $3$: Count the primary alcohols. There are two: Butan$-1-$ol and $2-$Methylpropan$-1-$ol.Therefore, the number of primary isomeric alcohols is $2$.

The number of primary isomeric alcohols with the molecular formula $C_4H_{10}O$ is:

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