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5. Dehydration of [tex]CH _3- CH _2- CH _2- CH _2- OH[/tex] gives:
A. [tex]CH _2= CH - CH _2- CH _3[/tex]
B. [tex]CH _3 CH = CH - CH _3[/tex]
C. [tex]H - C \equiv C - CH _2- CH _3[/tex]
D. [tex]CH _3- C \equiv C - CH _3[/tex]

6. The general formula of alkanols is represented as:
A. [tex]CnH _{3 n +2} OH[/tex]
B. [tex]CnH _{2 n +1} OH[/tex]
C. [tex]CnH _{4 a -1} OH[/tex]
D. [tex]CnH _{2 n +3} OH[/tex]

7. The simplest alcohol is:
A. [tex]CH _3 OH[/tex]
B. [tex]CH _3 CH _2 CH _2 OH[/tex]
C. [tex]CH _3 CH _2 OH[/tex]
D. [tex]CH _3 CH _2 CH _2 CH _2 OH[/tex]

8. The most widely consumed alcohol is:
A. Methanol
B. Propanol
C. Butanol
D. Ethanol

Sagot :

GinnyAnswer
Sure, let’s go step-by-step to answer each of these questions.

### Question 5: Dehydration of [tex]$CH_3-CH_2-CH_2-CH_2-OH$[/tex]

Dehydration of an alcohol typically involves the elimination of water (H₂O) to form an alkene. For the given alcohol, 1-butanol (butan-1-ol), the product of its dehydration will be an alkene.

The structural formula of 1-butanol is [tex]$CH_3-CH_2-CH_2-CH_2-OH$[/tex]. When it undergoes dehydration (typically in the presence of a strong acid like sulfuric acid and heat), it forms 1-butene:

[tex]$CH_3-CH_2-CH_2-CH_2-OH \rightarrow CH_2=CH-CH_2-CH_3 + H_2O$[/tex]

So, the correct option is:
- A. [tex]$CH_2=CH-CH_2-CH_3$[/tex]

### Question 6: General formula for alkanols

Alkanols, also known as alcohols, have the general formula [tex]$CnH_{2n+1}OH$[/tex], where [tex]\(n\)[/tex] is the number of carbon atoms.

So, the correct option is:
- B. [tex]$CnH_{2n+1}OH$[/tex]

### Question 7: The simplest alcohol

The simplest alcohol is the one with the smallest number of carbon atoms. Methanol ([tex]$CH_3OH$[/tex]) has only one carbon atom.

So, the correct option is:
- A. [tex]$CH_3OH$[/tex]

### Question 8: The most widely consumed alcohol

The most widely consumed alcohol is ethanol. It is commonly found in alcoholic beverages such as beer, wine, and spirits.

So, the correct option is:
- D. Ethanol

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To summarize:

5. A. [tex]$CH_2=CH-CH_2-CH_3$[/tex]
6. B. [tex]$CnH_{2n+1}OH$[/tex]
7. A. [tex]$CH_3OH$[/tex]
8. D. Ethanol
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