Give the name and structure of the following compounds:
$(i)$ Methanal $(ii)$ Ethanal $(iii)$ $2$-Methylpropanal $(iv)$ $3$-Methylcyclohexanecarbaldehyde $(v)$ $2$-Methoxypropanal $(vi)$ Pentanal $(vii)$ Prop-$2$-enal $(viii)$ Benzene-$1,2$-dicarbaldehyde $(ix)$ $3$-Bromobenzaldehyde

(A) The structures for the given $IUPAC$ names are as follows:
$(i)$ Methanal: $HCHO$
$(ii)$ Ethanal: $CH_3CHO$
$(iii)$ $2$-Methylpropanal: $(CH_3)_2CHCHO$
$(iv)$ $3$-Methylcyclohexanecarbaldehyde: $C_6H_{10}(CH_3)CHO$ (with the aldehyde group attached to the ring)
$(v)$ $2$-Methoxypropanal: $CH_3CH(OCH_3)CHO$
$(vi)$ Pentanal: $CH_3CH_2CH_2CH_2CHO$
$(vii)$ Prop-$2$-enal: $CH_2=CHCHO$
$(viii)$ Benzene-$1,2$-dicarbaldehyde: $C_6H_4(CHO)_2$ (ortho-substituted)
$(ix)$ $3$-Bromobenzaldehyde: $C_6H_4(Br)CHO$ (meta-substituted)