Give a line$-$angle structure for the following condensed structure. Do not forget to add all non$-$bonding electrons where appropriate.

$1$

a$.NCC{H}_{2}COC{H}_2$CHO

b$.C{H}_{2}CHCH(OH)C{H}_{2}C{O}_{2}H$

c$.(C{H}_{3}C{H}_2{)}_{2}CHC{H}_{2}CH(OH)CH(C{H}_3)CHO$

Indicate the correct functional groups for the circled areas in the provided structure.

State whether the following pairs of structures are the same structure just looked at from a different direction$/$drawn in a different way OR whether they are structural isomers OR completely different structures that are not isomers.

a$.$

b$.$

$C{H}_{3}C{H}_2$COCH$(C{H}_3{)}_2$

c$.$

d$.$