Question

(a) Which of the following are position isomers ?
`{:((i)" "CH_(2)=CH" "(ii)" "CH_(3)-C-CH_(3)" "(iii)" "CH_(3)-CH=C-CH_(3)),(" |"" ||"" |"),(" "CH_(2)-CH_(3)" "CH_(2)" "CH_(2)):}`
(b) Write the IUPAC name of the functional isomer of `CH_(3)CH_(2)CH_(2)CH_(2)CHO`.
(c) Which type of structural isomerism is shown by the following pair of compounds ?
`{:(" "Br" "CH_(3)),(" |"" |"),(CH_(3)-CH-CHBr_(2) and Br_(2)CH-CH-Br):}`

Answer 1

(a) Structure (i) and (ii) represent position isomers as they differ in the position of the double bond. Structure (iii) has different molecular formula. It is therefore, not an isomer.
(b) `CH_(3)-overset(O)overset("||")(C)-CH_(2)-CH_(2)CH_(3)` : Pentan-2-one.
(c) These represent the same compound. Their IUPAC name is also same i.e., 1, 1, 2-tribromopropane.