Write all the possible structures for the molecular formula `C_(5)H_(11)Br`. Give their IUPAC names. Which of these are optically active ?

Explanation

`CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)Br" "1-underset(("Primari"))("Bromopentane")`
`(ii)CH_(3)-underset(Br)underset(|)overset(**)(C)H-CH_(2)CH_(2)CH_(3)" "2-underset(("seondary"))(Bromopentane)`
`(iii) CH_(3)CH_(2)underset(Br)underset(|)CH-CH_(2)CH_(5)" "3-underset(("secondary"))("Bromopentane")`
`(iv) CH_(3)CH_(2)underset(CH_(3))underset(|)overset(**)(C)H-CH_(2)Br " "1-underset(("Pricmary"))("Bromopentane")`
`(v) CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)CH_(2)Br 1-underset(("Primary"))("Bromo-3-methylbutane")`
`(vi) CH_(3)CH_(2) -overset(CH_(3))overset(|)underset(Br)underset(|)C-CH_(3) " "2-underset(("tertiary"))("Bromo-2-methylbutane")`
`(vii) CH_(3)-underset(CH_(3))underset(|)CH-underset(Br)underset(|)overset(**)(CH)-CH_(3)" "2 -underset(("secondary"))("Bromo-3-methylbutane")`
`(viii) CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-CH_(2) Br " "1-underset(("Primary"))("Bromo-2,2- dimethylpropane")`
The optically active isomers: (ii) , (iv) and (vii),