Write the structures of the following compounds:
$(i)$ $\alpha$-Methoxypropionaldehyde
$(ii)$ $3$-Hydroxybutanal
$(iii)$ $2$-Hydroxycyclopentanecarbaldehyde
$(iv)$ $4$-Oxopentanal
$(v)$ Di-sec-butyl ketone
$(vi)$ $4$-Fluoroacetophenone

Match the $IUPAC$ name of the carbonyl compound in Column-$I$ with its structure in Column-$II$ and its common name in Column-$III$.

Column-$I$ ($IUPAC$ name)	Column-$II$ (Structure)	Column-$III$ (Common name)
$A. 4$-oxopentanal	$i. CH_3CH_2CH_2CH_2CHO$	$p. \text{Acetyl acetone}$
$B. \text{Ethane-}1,2\text{-dial}$	$ii. CH_3COCH_2CH_2CHO$	$q. \text{Valeraldehyde}$
$C. \text{Pentane-}2,4\text{-dione}$	$iii. CHOCHO$	$r. \beta\text{-acetyl propionaldehyde}$
$D. \text{Pentanal}$	$iv. CH_3COCH_2COCH_3$	$s. \text{Glyoxal}$

Which of the following compounds does not contain an $-OH$ group?

Give the structures of the following compounds:
$(i)$ $4-$Nitropropiophenone
$(ii)$ $2-$Hydroxycyclopentanecarbaldehyde
$(iii)$ Phenyl acetaldehyde

Which one is the common name of the compound $CH_2=CH-CHO$?

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. |