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(B) The structural isomers of $C_5H_{11}Br$ are: $1$. $1$-bromopentane: $CH_3CH_2CH_2CH_2CH_2Br$ $\rightarrow$ $1$-pentanol (achiral). $2$. $2$-bromop

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$3$

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(B) The structural isomers of $C_5H_{11}Br$ are: $1$. $1$-bromopentane: $CH_3CH_2CH_2CH_2CH_2Br$ $\rightarrow$ $1$-pentanol (achiral). $2$. $2$-bromopentane: $CH_3CH_2CH_2CH(Br)CH_3$ $\rightarrow$ $2$-pentanol ($CH_3CH_2CH_2CH(OH)CH_3$,chiral). $3$. $3$-bromopentane: $CH_3CH_2CH(Br)CH_2CH_3$ $\rightarrow$ $3$-pentanol (achiral). $4$. $1$-bromo-$2$-methylbutane: $CH_3CH_2CH(CH_3)CH_2Br$ $\rightarrow$ $2$-methyl-$1$-butanol ($CH_3CH_2CH(CH_3)CH_2OH$,chiral). $5$. $2$-bromo-$2$-methylbutane: $CH_3CH_2C(Br)(CH_3)_2$ $\rightarrow$ $2$-methyl-$2$-butanol (achiral). $6$. $2$-bromo-$3$-methylbutane: $CH_3CH(Br)CH(CH_3)_2$ $\rightarrow$ $3$-methyl-$2$-butanol ($CH_3CH(OH)CH(CH_3)_2$,chiral). $7$. $1$-bromo-$3$-methylbutane: $CH_3CH(CH_3)CH_2CH_2Br$ $\rightarrow$ $3$-methyl-$1$-butanol (achiral). $8$. $1$-bromo-$2,2$-dimethylpropane: $(CH_3)_3CCH_2Br$ $\rightarrow$ $2,2$-dimethyl-$1$-propanol (achiral). Among the products,$2$-pentanol,$2$-methyl-$1$-butanol,and $3$-methyl-$2$-butanol exhibit optical isomerism. Thus,the number of products is $3$.

Consider all the structural isomers with molecular formula $C_5H_{11}Br$. They are separately treated with $KOH$ $(aq)$ to give respective substitution products,without any rearrangement. The number of products which can exhibit optical isomerism from these is . . . . . . .

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