Which among the following is an aromatic aldehyde?

Which structure represents $3-$methyl$-2-$pentanone?

Explain the $IUPAC$ nomenclature of aldehydes and ketones.

Identify the aldehyde from the following in which the aldehydic group $(-CHO)$ is $NOT$ attached to any $sp^3$ hybridized carbon atom.

In column-$I$,diagrams of the carbonyl group are given,and in column-$II$,their descriptions are given. Match column-$I$ with the correct option given in column-$II$.
| Column-$I$ (Drawing diagram) | Column-$II$ (Description) |
| :--- | :--- |
| $(A)$ Resonance structures of carbonyl group | $(i)$ In carbon-oxygen,$\pi$-electron clouds are present on the upper and lower parts of the plane. |
| $(B)$ Geometry of carbonyl group | (ii) Non-bonding $2p$ orbital which is not taking part in hybridization of carbonyl carbon and $2p$ orbital of oxygen containing one electron are parallel to each other and perpendicular to the plane. |
| $(C)$ $\sigma$-bonding in carbonyl group | (iii) Hybridization of carbonyl carbon is $sp^2$ and it has a planar triangular structure and bond angle approximately $120^{\circ}$. |
| $(D)$ $\pi$-bonding in carbonyl group | (iv) Two hybrid structures of the carbonyl group indicate that the carbon-oxygen bond is polar in nature and also the carbon atom is an electrophilic centre and the oxygen atom is a nucleophilic centre. |

Match the common names given in Column-$I$ with the $IUPAC$ names given in Column-$II$.

Column-$I$ (Common names)	Column-$II$ ($IUPAC$ names)
$A$. Cinnamaldehyde	$1$. Pentanal
$B$. Acetophenone	$2$. Prop-$2$-en-$al$
$C$. Valeraldehyde	$3$. $4$-Methylpent-$3$-en-$2$-one
$D$. Acrolein	$4$. $3$-Phenylprop-$2$-en-$al$
$E$. Mesityl oxide	$5$. $1$-Phenylethanone