Complex sentence: Acetyl cyanide is a carbon chain that contains both a nitrile and a carbonyl group, therefore making the molecule fall with the cyanide group due to the presence of the carbon nitrogen triple bond.
Split into simpler sentences: Acetyl cyanide is a carbon chain that contains both a nitrile and a carbonyl functional group. Therefore, the molecule falls into the cyanide group as well due to the presence of the carbon nitrogen triple bond.