A hydrocarbon has a molecular mass of 84 g/m | vedclass

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(C) The general formula for an alkane is $C_nH_{2n+2}$ and for a cycloalkane or alkene is $C_nH_{2n}$.Given molecular mass = $84 \ g/mol$.For $C_nH_{2

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$6$

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(C) The general formula for an alkane is $C_nH_{2n+2}$ and for a cycloalkane or alkene is $C_nH_{2n}$.Given molecular mass = $84 \ g/mol$.For $C_nH_{2n}$,the mass is $12n + 2n = 14n$.$14n = 84 \implies n = 6$.The hydrocarbon is $C_6H_{12}$.Structural chain isomers for $C_6H_{12}$ (alkenes) are:$1$. $Hex-1-ene$$2$. $2-methylpent-1-ene$$3$. $3-methylpent-1-ene$$4$. $2,3-dimethylbut-1-ene$$5$. $3,3-dimethylbut-1-ene$$6$. $2-ethylbut-1-ene$There are $6$ structural chain isomers for the alkene $C_6H_{12}$.

$A$ hydrocarbon has a molecular mass of $84 \ g/mol$. What is the number of its structural chain isomers?

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