ALCOHOL

Multiple Choice Questions

Q1. Which of the following hydrocarbon family has the highest boiling point?

A. Alkane

B. Halo-alkane

C. Ether

D. Alcohol

Q2. Lower alcohols like methanol burn with a blue flame to form carbon dioxide and water in the presence of atmospheric oxygen. Such a type of reaction is called

A. Combustion

B. Dehydration

C. Esterification

D. Oxidation

Q3. Alcohols are viscous liquids and their viscosity depends on the strength of the inter-molecular forces. The alcohol with the highest viscosity is:

A. Methanol

B. Ethanol

C. Heptanol

D. Octanol

Q4. The molecular formula of butanol is

A. C₄H₈OH

B. C₄H₉OH

C. C₄H₁₀OH

D. C₄H₇OH

Q5. The reaction of carboxylic acids with alcohols in the presence of. H₂SO₄ as a catalyst is

A. Combustion

B. Esterification

C. Oxidation

D. Neutralization

Q6. Which of the following sequence is correct for the oxidation of alcohol?

A. Ethanol→ Ethanal→ Ethanoic acid

B. Ethanol→ Ethanoic acid→ Ethanal

C. Ethanal→ Ethanol→ Ethanoic acid

D. Ethanal→ Ethanoic acid→ Ethanol

Q7. The molecular formula of alcohol having six carbon atoms is

A. C₆H₁₀OH

B. C₆H₁₁OH

C. C₆H₁₂OH

D. C₆H₁₃OH

Q8. Police use breath analyzer to detect the level of alcohol in drivers. Which property of alcohol is used in breath analyzers?

A. reducing property

B. oxidising property

C. denaturing property

D. dehydrating property

Q9. The correct structural formula of butanol is

A.

B.

C.

D.

Q10. The IUPAC name for the CH₃CH₂CH₂OH is

A. Methanol

B. Ethanol

C. Propanol

D. Butanol

Questions

Q1. Fill in the blanks:

a) The biofuel mixture of 30% ethanol and petrol is called _______________.

Ans.: gasohol

b) High solubility of ethyl alcohol in water is due to formation of high _______________ hydrogen bonding.

Ans.: intra-molecular

c)

Ans.: 2C₂H₅OH

Q2. Why burning ethanol fuel is considered neutral to the environment?

Ans.: It is because the amount of carbon dioxide released during ethanol production is the same as the amount absorbed by the crops grown as a feedstock.

Q3.Why fractional distillation is used for the rectification of ethanol

 Ans.: Because to remove impurities.

Q4. Why ethanol is collected before water during distillation?

Ans.: It is because ethanol has lower boiling than water.

Q5. The chemical equation given below is the examples of:

a)

Ans.: DEHYDRATION as there is the removal of a water molecule from the alcohol (propanol)

b)

Ans.: ESTERIFICATION, since there is the formation of ester (CH₃COOC₂H₅)

Q6. Following are the structures of the first three members of a homologous series of alcohols. Based on the structures, answer the following questions:

i) CH₃OH ii) CH₃CH₂OH iii) CH₃CH₂CH₂OH

a) Write the general formula of alcohols.

Ans.: C_nH_2n+1OH

b) Arrange the three structures in increasing order of their boiling points. [1]

Ans.: i > ii > iii

c) Write the molecular formula of an alcoholic compound having 10 carbon atoms.

Ans.: C₁₀H₂₁OH

Q7. Write the IUPAC name of the following:

a) CH₃OH

b) C₂H₅OH

c) C₃H₇OH

d) C₆H₁₃OH

e) C₉H₁₉OH

Ans.:

a) Methanol    

b) Ethanol        

c) Propanol   

d) Hexanol    

e) Nonanol

Q8. Write the IUPAC name for the given structure.

a) CH₃CH₂CH₂OH

b) CH₃CH=CHCH₂CH₃

c) CH₃CH=CH₂

Ans.:

a) Propanol        

b) Pent-2-ene/pentene      

c) Prop-1- ene / propene

Q9. Represent the condensed formula for

a) Propanol

b) Butanol

Ans.:

a) CH₃CH₂CH₂OH

b) CH₃CH₂CH₂CH₂OH

Q10. Write the structural formula for the following compounds.

i) 2-methyl-3-pentanol

ii) Hexan-3-ol

Ans.:  

i)

ii)

Compiled from BCSE 2017-2021