(i) Butaneon
(ii) propan-2-ol
Here, the- OH group is attached to the second carbon. count the carbon atoms such that the carbon containig the functional group gets the lowest number.
(iii) Methanoic acid
(iv) Methyl ethonate
The carbon group (alkaly part obtained from alcohol ) attached to O of -COO
group (denoted by R') is mentioned in the fist part of IUPAC name.
The carbon chain obtained from carboxylic acid (denoted by R) is represented in the second part of the name (the- oate) part.