The number of secondary hydrogens in 2, 2-dim | vedclass

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(D) The structure of $2, 2-$dimethylbutane is $CH_3-C(CH_3)_2-CH_2-CH_3$. In this molecule: $1.$ Primary $(1^\circ)$ carbons are the terminal carbons

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$2$

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(D) The structure of $2, 2-$dimethylbutane is $CH_3-C(CH_3)_2-CH_2-CH_3$. In this molecule: $1.$ Primary $(1^\circ)$ carbons are the terminal carbons and the methyl branches. There are $4$ such carbons,having $12$ primary hydrogens. $2.$ Secondary $(2^\circ)$ carbon is the $-CH_2-$ group at position $3$. It has $2$ secondary hydrogens. $3.$ Quaternary $(4^\circ)$ carbon is at position $2$,which has no hydrogens. Therefore,the number of secondary hydrogens is $2$.

The number of secondary hydrogens in $2, 2-$dimethylbutane is

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