Which types of isomers of $C_4H_8$ are possible? Give their names and structures.
(N/A) The isomers of $C_4H_8$ (degree of unsaturation = $1$) can be classified as follows:
$1$. Chain Isomers:
- $But-1-ene$ $(CH_3CH_2CH=CH_2)$
- $2-Methylprop-1-ene$ $(CH_3C(CH_3)=CH_2)$
$2$. Position Isomers:
- $But-1-ene$ $(CH_3CH_2CH=CH_2)$
- $But-2-ene$ $(CH_3CH=CHCH_3)$
$3$. Geometric Isomers:
- $cis-But-2-ene$
- $trans-But-2-ene$
$4$. Cyclic Isomers:
- $Cyclobutane$
- $Methylcyclopropane$
$1$. Chain Isomers:
- $But-1-ene$ $(CH_3CH_2CH=CH_2)$
- $2-Methylprop-1-ene$ $(CH_3C(CH_3)=CH_2)$
$2$. Position Isomers:
- $But-1-ene$ $(CH_3CH_2CH=CH_2)$
- $But-2-ene$ $(CH_3CH=CHCH_3)$
$3$. Geometric Isomers:
- $cis-But-2-ene$
- $trans-But-2-ene$
$4$. Cyclic Isomers:
- $Cyclobutane$
- $Methylcyclopropane$
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$(I)$ The reactions are stereospecific.
$(II)$ $(X)$ is erythro and $(Y)$ is threo isomer.
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