Question

Pinacolone is:
A. 2-3-dimethyl-2, 3-butanediol
B. 3,3- dimethyl-2butanone
C. 1-phenyl-2-propanone
D. 1,1-diphenyl-1, 2-ethanediol

Answer 1

Hint: The molecular formula of pinacolone is \[\mathop C\nolimits_6 \mathop H\nolimits_{12} O\] and the linear formula of the substance is \[C\mathop H\nolimits_3 COC\mathop {\left( {C\mathop H\nolimits_3 } \right)}\nolimits_3 \] .

Complete step by step answer:
In this question we have asked about the chemical name of the pinacolone. So, first of all, what is pinacolone? Pinacolone is an important ketone in organic chemistry. It is a colorless liquid and has a slight peppermint and has an odor like camphor. The molecular formula of pinacolone is \[\mathop C\nolimits_6 \mathop H\nolimits_{12} O\]. The molecule is an unsymmetrical ketone and as we have already mentioned earlier, the linear formula of pinacolone is \[C\mathop H\nolimits_3 COC\mathop {\left( {C\mathop H\nolimits_3 } \right)}\nolimits_3 \].

From the structure of pinacolone, when we named it according to IUPAC, it has 4 carbon atoms and hence, the parent carbon chain will be butane. Its 3rd C has 2 methyl groups on it and the functional group is ketone present on the 2nd carbon. So, the IUPAC name will be 3,3-dimethyl-2-butanone.

So, the correct option is B. 3,3- dimethyl-2-butanone.

Note:
Pinacolone is important in organic chemistry because it is made up from a very important reaction called pinacol- pinacolone rearrangement. The pinacol–pinacolone rearrangement is a method for converting a 1,2-diol to a carbonyl compound in organic chemistry. The 1,2-rearrangement takes place under acidic conditions. The name of the reaction comes from the rearrangement of pinacol to pinacolone.