The number of tertiary carbon atoms in the compound $\left({\mathrm{CH}}_{\mathrm{3}}{\mathrm{)}}_{\mathrm{2}}{\mathrm{CHCH}}_{\mathrm{2}}\mathrm{C}\right({\mathrm{CH}}_{\mathrm{3}}{\mathrm{)}}_{\mathrm{3}}$ is ______

Which of the following compounds is $2, 2, 3-$trimethylhexane?

The structure of isobutyl group in an organic compound is _____.

$\mathrm{IUPAC}$ name of the compound

$$\begin{gathered} {\mathrm{CH}}_{\mathrm{3}}\mathrm{-}\underset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{\mathrm{2}}-\mathrm{CH}\left(\mathrm{OH}\right)-{\mathrm{CH}}_{\mathrm{3}} \\ \mathrm{ }\underset{|}{\mathrm{C}}{\mathrm{H}}_{\mathrm{2}} \\ {\mathrm{CH}}_{\mathrm{3}} \end{gathered}$$ is _____

Identify the CORRECT decreasing order of priority of the functional groups from the following______.

The $\mathrm{IUPAC}$ name of

$$\begin{gathered} {\mathrm{CH}}_{\mathrm{3}}\mathrm{-}\underset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{\mathrm{2}}\mathrm{-}\underset{|}{\mathrm{C}}\mathrm{H}-\mathrm{CHO} \\ \mathrm{OH} {\mathrm{CH}}_{\mathrm{3}} \end{gathered}$$ will be ______

The$\mathrm{IUPAC}$ name of 

${\mathrm{CH}}_{\mathrm{3}}-\mathrm{CO}-({\mathrm{CH}}_{\mathrm{2}}{\mathrm{)}}_{\mathrm{2}}-{\mathrm{CH}}_{\mathrm{3}}$ is _____

$\mathrm{IUPAC}$ name of ${\mathrm{CH}}_{\mathrm{2}}=\mathrm{CH}-\mathrm{CH}({\mathrm{CH}}_{\mathrm{3}}{\mathrm{)}}_{\mathrm{2}}$ is ________.

The $\mathrm{IUPAC}$ name of 

$$\begin{gathered} ({\mathrm{CH}}_3{)}_2\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\underset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_3 \\ {\mathrm{C}}_2{\mathrm{H}}_5 \end{gathered}$$ is ______.