The total number of isomers,considering both | vedclass

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(C) The molecular formula $C_4H_8O$ corresponds to a degree of unsaturation of $1$. For cyclic ethers,we consider the following structures:$1$. Tetrah

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$10$

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(C) The molecular formula $C_4H_8O$ corresponds to a degree of unsaturation of $1$. For cyclic ethers,we consider the following structures:$1$. Tetrahydrofuran $(THF)$: $1$ isomer.$2$. $2$-methyl-oxetane: Has a chiral center,so it exists as a pair of enantiomers ($R$ and $S$). Total = $2$ isomers.$3$. $3$-methyl-oxetane: Achiral. Total = $1$ isomer.$4$. $2$-ethyl-oxirane: Has a chiral center,so it exists as a pair of enantiomers ($R$ and $S$). Total = $2$ isomers.$5$. $2,3$-dimethyl-oxirane: Has two chiral centers. It exists as $(R,R)$,$(S,S)$ (enantiomeric pair) and $(R,S)$ (meso compound). Total = $3$ isomers.$6$. $1,1$-dimethyl-oxirane: Achiral. Total = $1$ isomer.Summing these up: $1 + 2 + 1 + 2 + 3 + 1 = 10$ isomers.

Column-$I$	Column-$II$
$(A)$ Carbocation	$(1)$ Cyclohexane and $1$-hexene
$(B)$ Nucleophile	$(2)$ Conjugation of electrons of $C-H$ $\sigma$-bond with empty $p$-orbital present at adjacent positively charged carbon
$(C)$ Hyperconjugation	$(3)$ $sp^{2}$ hybridised carbon with empty $p$-orbital
$(D)$ Isomers	$(4)$ Ethyne
$(E)$ $sp$ hybridisation	$(5)$ Species that can receive a pair of electrons
$(F)$ Electrophile	$(6)$ Species that can supply a pair of electrons

The total number of isomers,considering both structural and stereoisomers,of cyclic ethers with the molecular formula $C_4H_8O$ is. . . . . .

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