Which of the following is symmetrical ketone?

The IUPAC name of the following compound is _________

Write the IUPAC name of this compound,

.

The IUPAC name of the following compound is _________ 

What is the IUPAC name of 'Acrolein'?

Give the $\mathrm{IUPAC}$ name of 

Name the following compounds according to IUPAC System of Nomenclature:

(i) ${\mathrm{CH}}_3\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{CHO}$
(ii) ${\mathrm{CH}}_3\mathrm{CH}\left({\mathrm{CH}}_3\right){\mathrm{CH}}_2\mathrm{C}{\left({\mathrm{CH}}_3\right)}_2{\mathrm{COCH}}_3$

The $\mathrm{IUPAC}$ name for the following compound is