Question

The compound \[{\left( {C{H_3}} \right)_2}C\left( {OH} \right)C{H_2}C{H_3}\] ​ is called
A. \[2\]-methyl butan-\[2\]-ol
B. isoamyl alcohol
C. ethyl dimethyl carbinol
D. tert- pentyl alcohol

Answer 1

Hint: a compound can be named in different ways. The standard name of the compound is given by IUPAC nomenclature. A compound can be also well known by common names. Naming can be on the basis of the functional group the compound has.

Complete step-by-step answer:Naming according to the IUPAC nomenclature
Identify the parent chain having a maximum number of carbons that is $4$ in this case. Hence the base name is 'but'.
Give numbering to the carbon parent chain keeping in mind that priority is first given to the functional group and then to the side substituents.
Functional group in the given compound is alcohol and there is one methyl group as side substituent. Numbering is given accordingly and both methyl and alcohol are numbered at second position
Hence the correct name according to IUPAC nomenclature is \[2\]-methyl butan-\[2\]-ol.

There can be a common name for the compound.
Total number of carbon present in the given compound is \[5\]. Hence it is named as 'pent'. The functional group that is alcohol is connected to a carbon which is attached to three more carbons hence, the carbon is a \[3^\circ \] carbon or tertiary carbon. Thus, its common name is tert- pentyl alcohol.

Also, a common name of the given compound can be ethyl dimethyl carbinol
Carbinols are an old fashion of naming carbon with an alcohol group. On the right side of the carbon to which alcohol is attached, there is ethyl group and on the left to it there are two methyl groups.

Option ‘ A, C and D ’ are correct

Note: A compound can be named in various ways the standard way of naming compounds is by using IUPAC naming however, there are certain IUPAC accepted common names that are also assigned to a compound.