24. Reaction of ethylmagnesium bromide with which of the following compounds yields a tertiary alcohol after quenching with aqueous acid? (A) H2CO (B) CH3CHO (C) (CH3)2CO (D) ethylene oxide (E) n-butyllithium

25. What starting materials would be suitable for preparing this compound by a combination of Michael and aldol reactions? (A) 4-methyl-2-cyclohexen-1-one and 3-butenal (B) 2-methylcyclohexane-1,3-dione and 3-buten-2-one (C) 2-methyl-2-vinyl-3-cyclohexen-1-one and acetaldehyde (D) 2-methyl-2-cyclohexen-1-one and 1,4-dichlorobutan-2-one (E) 4-methylcyclohexnone and methyl vinyl ketone

24. Reaction of ethylmagnesium bromide with which of the following compounds yields a tertiary alcohol after quenching with aqueous acid?
(A) H₂CO
(B) CH₃CHO
(C) (CH₃)₂CO
(D) ethylene oxide
(E) n-butyllithium

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