Question

IUPAC Name of
a) (CH3)3C-CH=CH-C= CH b) CHO-CH2-CH=CH-CHO
c) CH3-CH2-CH2-CH=C (OH)-CH2-COOH​

Answer 1

Answer:

1. 3,3 _Dimethyl -1-butene
2. 3-Hydroxy -pent -4 -ene -l-al
3. 3-Hydroxy-3-methylbutane-2-one

Explanation:

1. The parent hydrocarbon contains 4 C atoms and a C=C double bond. Hence, it is a butene. Two methyl groups are present as substituents on third C atom. Prefix di indicates two methyl groups.
2. The longest chain is with 5 carbon atoms.
3. It is an alkene so the suffix used is ‘ene’ and the double bond is at 4th position.
4. Hydroxyl group is present at third carbon and also the aldehyde group is present.
5. Hence the name of the given compound is 3-Hydroxy-pent-4-ene-1-al.
6. The following structure contain four carbon atom in the longest continuous chain along with ketone and alcohol functional groups. In the priority order ketone have higher priority then alcohol. Hence, ketone will form the suffix of the name and alcohol will become prefix.