23) What is the IUPAC name for Yules OH a4-Oxo-5-phenyl-2-hexanol b) 5-Hydroxy-2-phenyl-3-hexanone C)R-Hydroxy-5-phenyl-4-hexanone 2-Hydroxypropyl-1-phenylethyl ketone OH es-Hydroxy-3-keto-2-phenylhexane 24)Acetals are unstable in the presence of an aqueous solution of which of these a) pecause an acue NaOH c) KHCO d) Na:COs e) NaC 25) LiAIHa (LAH) cannot be used to convert carboxylic acids to the corresponding aldehydes because: a) LAH is not sufficiently reactive. b) RCOOH is converted into RCOOLi. RCOOH is reduced to RCH-OH RCOOH is reduced to RCH e) RCOOH is converted into R C-O dlechal 26) The'H NMR spectrum of a compound with formula ChHisO gives three signals. Which of these structures is a possible one for this compound? a) 2-Heptanone b) 3-Heptanone of thc Sulstioent 2,4-Dimethyl-3-pentanone d) 2,2-Dimethyl-3-pentanone e) Two of these choices. 27) The'H NMR spectrum of a compound with formula CHu0 gives two signals. Which of these structures is a possible one for this compound? methyl a) 2-Heptanone 3-Heptanone )2,4-Dimethyl-3-pentanone e) Two of these choices 2,2-Dimethyl-3-pentanone