Consider compound X which is an ester:X reacted with hot aqueous sodium hydroxide solution and formed compounds M and N. X reacted with an aqueous sulfuric acid solution and produced compounds M and Q. M is a :

Question

BlackTom AI · Accepted Answer

Ester hydrolysis yields an alcohol and a carboxylic acid (or the corresponding carboxylate salt under basic conditions).

1. Relevant knowledge points and concepts
- Esters (RCOOR') undergo hydrolysis. Under acidic conditions (H2O/H+ catalyst) they give a carboxylic acid (RCOOH) plus an alcohol (R'OH). Under basic conditions (saponification, e.g., NaOH) they give the carboxylate salt (RCOO– Na+) and the same alcohol (R'OH).
- The alcohol fragment comes from the alkoxy (–OR') portion of the ester and is the same product in both acidic and basic hydrolysis.

2. Complete step-by-step reasoning
- Let X = RCOOR'. React X with hot aqueous NaOH:
  RCOOR' + OH– → RCOO– + R'OH  (then RCOO– pairs with Na+ to give RCOO– Na+)
  Products named: M and N. Under base hydrolysis, one product is the alcohol R'OH and the other is the sodium carboxylate salt.
- React X with aqueous H2SO4 (acidic hydrolysis):
  RCOOR' + H2O (H+) → RCOOH + R'OH
  Products named: M and Q. Under acid hydrolysis, one product is the alcohol R'OH and the other is the carboxylic acid.

3. Intermediate steps / equations shown above
- Base: RCOOR' + NaOH → RCOO– Na+ (N) + R'OH (M)
- Acid: RCOOR' + H2O + H+ → RCOOH (Q) + R'OH (M)

4. Why the correct answer is correct
- In both reactions the common product M must be the alcohol (R'OH). That functional class is an alkanol (if R' is an alkyl group), so M is an alkanol.

5. Why other options are incorrect
- Alkanoic acid: appears only in acidic hydrolysis (Q), not the common product M in both cases.
- Water: not produced as the common organic product here.
- Sodium: an element/ion, not an organic compound produced as M.
- Salt: the sodium carboxylate salt is produced only in basic hydrolysis (N), not in both reactions.

6. Conclusion
- Therefore M is an alkanol, which matches the provided correct answer.

Consider compound X which is an ester:X reacted with hot aqueous sodium hydroxide solution and formed compounds M and N. X reacted with an aqueous sulfuric acid solution and produced compounds M and Q. M is a :单项选择题

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