Question 69: [Organic > Hydroxyl Compounds]
In a preparation of ethene, ethanol is added a drop at a time to a heated reagent Y. To purify the ethane it is bubbled through a solution Z and then collected.
What could reagent reagent Y and solution Z be?
| | reagent Y | solution Z |
| A | acidified K2Cr2O7 | dilute NaOH |
| B | concentrated H2SO4 | dilute H2SO4 |
| C | concentrated H2SO4 | dilute NaOH |
| D | ethanolic NaOH | concentrated H2SO4 |
Reference: Past Exam Paper –June 2003 Paper 1 Q29
Solution 69:
Answer: C.
Alcohol undergoes dehydration to form an alkene. Concentrated H2SO4 is among the possible conditions for this reaction. This eliminates options A and D as possible answers. After dehydration occurs there may be remaining H2SO4 mixed with the alkene. This remainder must be neutralised. It is acidic and in option B, the addition of more H2SO4 will contaminate the alkene more, thus is an incorrect answer. A basic solution will neutralise the acid, such as the dilute NaOH in option C, which is the correct answer.
Hiç yorum yok:
Yorum Gönder