Part $1.$

Match the peak to the most likely functional group it indicates.

Peak a

Peak b

Peak c

$O-H$ stretch

$N-H$ stretch

$C=O$ stretch

$C-=N$ stretch

C$-$H stretch from an alkynyl group

C$-$H stretch from an alkeny$//$aromatic group

$C-H$ stretch from an alkyl group

C$-$H stretch from an aldehyde

$C=C$ stretch from an alkynyl group

$C=C$ stretch from an alkeny$//$aromatic group

overtone$/$combination band

Fingerprint region peak