Question

Which is/are wrong IUPAC name?

• A. $C{H}_{3}C{H}_{2}C{H}_{2}COOC{H}_{2}C{H}_3$ (Ethylbutanoate)
• B. $C{H}_3\underset{C{H}_3}{\underset{|}{C}H}C{H}_{2}CHO$ (3-Methyl butanol)
• C. $C{H}_3-\underset{OH}{\underset{|}{C}H}-\underset{C{H}_3}{\underset{|}{C}H}-C{H}_3$ (2-Methyl-3-butanol)
• D. $C{H}_3\underset{C{H}_3}{\underset{|}{C}H}COC{H}_{2}C{H}_3$ (2-methyl-3-pentanone)

Answer 1

Answer: (B), (C)

The correct options are
B $C{H}_3\underset{C{H}_3}{\underset{|}{C}H}C{H}_{2}CHO$ (3-Methyl butanol)
C $C{H}_3-\underset{OH}{\underset{|}{C}H}-\underset{C{H}_3}{\underset{|}{C}H}-C{H}_3$ (2-Methyl-3-butanol)

The IUPAC name of option B is incorrect because instead of butanol, it should be butanal.

The IUPAC name given in option C is incorrect. The carbon atoms in the longest chain should be numbered from the end which is nearest to the hydroxyl group.

Hence, the correct IUPAC name should be 3-methyl-2-butanol.

Options B and C are correct.