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(A) The molecular formula $C_5H_{10}$ corresponds to the general formula $C_nH_{2n}$,which indicates an alkene. The structural isomers are as follows:

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$5$

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(A) The molecular formula $C_5H_{10}$ corresponds to the general formula $C_nH_{2n}$,which indicates an alkene. The structural isomers are as follows: $1.$ $CH_2=CH-CH_2-CH_2-CH_3$ (Pent-$1$-ene) $2.$ $CH_3-CH=CH-CH_2-CH_3$ (Pent-$2$-ene) $3.$ $CH_2=C(CH_3)-CH_2-CH_3$ ($2$-Methylbut-$1$-ene) $4.$ $CH_3-C(CH_3)=CH-CH_3$ ($2$-Methylbut-$2$-ene) $5.$ $CH_2=CH-CH(CH_3)-CH_3$ ($3$-Methylbut-$1$-ene) Thus,there are $5$ structural isomers possible.

Write the structures and $IUPAC$ names of the different structural isomers of alkenes corresponding to the molecular formula $C_5H_{10}$. How many such isomers are possible?

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