In the group $>C=O$,the carbonyl carbon is joined to other atoms by

What is the physical state of formaldehyde at room temperature?

Which of the following statements is true for the carbonyl group?

Write the $IUPAC$ names of the following ketones and aldehydes. Wherever possible,give also common names.
$(i)$ $CH_{3}CO(CH_{2})_{6}CH_{3}$
$(ii)$ $CH_{3}CH_{2}CHBrCH_{2}CH(CH_{3})CHO$
$(iii)$ $CH_{3}(CH_{2})_{5}CHO$
$(iv)$ $Ph-CH=CH-CHO$
$(v)$ Cyclopentane ring attached to $-CHO$ group
$(vi)$ $PhCOPh$

What is the $IUPAC$ name of Mesityl oxide?

Which of the following aldehydes contains two $-CHO$ groups in a molecule?