The mechanism of aldol condensation paper

The mechanism of aldol condensation paper
546. Esters and amides are most easily made by nucleophilic acyl
substitution reactions on :
(a) acid anhydrides
(b) carboxylates
(c) carboxylic acids
(d) acid chlorides
Answer. (d)
547. Which of the following conditions will drive the equilibrium of the
Fischer esterification towards ester formation?
(a) addition of water
(b) removal of water as it is formed
(c) addition of alcohol
(d) both (b) and (c)
Answer. (d)
548. Which of the following statements describes the first step in the
mechanism of the aldol condensation?
(a) An alpha hydrogen is abstracted by the base to form an enolate anion.
(b) A nucleophilic base attacks the carbonyl carbon atom.
(c) The carbonyl oxygen is protonated by the base ion.
(d) The alpha hydrogen is abstracted by an acid to the enolate anion.
Answer. (a)
549. Ammonium acetate on strong heating gives
(a) Urea
(b) Formamide
(c) Uric acid
(d) Acetamide
Answer. (d)
550. Which reaction does not yield an ester as one of the products?
(a) A carboxylic acid is heated with an alcohol
(b) A Grignard reagent is added to a carboxylic acid
(c) An acid halide is treated with an alcohol
(d) An alkyl halide is heated with the salt of a carboxylic acid
Answer. (b)
551. Silver acetate reacts with Br2 to form methyl bromide, carbon dioxide,
and AgBr. This is an
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