ECAT Pre Engineering Chemistry Chapter 22 MCQ Test With Answer

Which one of the following correctly describes the acid properties of phenol

• Stronger than HCI A
• Stronger than carboxylic acid B
• An acid stronger than carbonic acid C
• An acid weaker than carboxylic acid D

Alcohols reacts with Grignard reagent to form

• Alkanes A
• Alkenes B
• Alkynes C
• All D

Which is possible in ethers?

• Reactivity high A
• Oxidation and reduction B
• Reactivity towards bases C
• Towards acids D

The organic compounds which derivative of hydrocarbons due to oxygen is:

• Phenol A
• Alcohol B
• Alkyl halide C
• Either D

• 1-bromobutane A
• 2-bromobutane B
• 1-bromo-2-methyl propane C
• 2-bromo-2-methyl propane D

Which compound shows more hydrogen bonding?

• C₂H₆ A
• C₂H₅Cl B
• CH₃----O----CH₃ C
• C₂H₅OH D

Dehydration of an alcohol at 180°

• Alkene A
• Ether B
• Ester C
• An hydride D

Dehydration of ethyl alcohol yields

• Aldehyde A
• Ketone B
• Acid C
• Alkene D

Taste of lower alcohols is:

• Sweet A
• Bitter B
• Our C
• Salty D

Grignard reagent on reaction with a ketone forms

• Tertiary alcohol A
• Secondary alcohol B
• Primary alcohol C
• Carboxylic acid D

Organic acid without a carboxylic acid group is

• Ascorbic acid A
• Vinegar B
• Oxalic acid C
• Picric acid D

The boiling points of alcohols are higher than the corresponding alkanes, This is because

• Of hydrogen bonding existing between molecules of alcohols A
• Alkanes are dipolar compounds B
• Alcohols are sweet in taste C
• Alcohols are soluble in water D

Alcohol can be denaturated by adding:

• Acetone A
• Methanol B
• Pyridine C
• All D

Alcohols of low molecular weight are

• Soluble in water A
• Soluble in water on heating B
• Insoluble in water C
• Insoluble in all solvents D

Which alcohol gives only one oxidation product when wormed with dil acidified K₂Cr₂O₇

• Butan-1-ol A
• Butan-2-ol B
• 2-methyl propan-1-ol C
• 2-methyl propan-2-ol D

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

• Formation of an ester A
• Protonation of alcohol molecule B
• Formation of carbocation C
• Elimination of water D

Methanol is prepared from CO and H_{2 using catalyst:}

• ZnO A
• Cr₂O₃ B
• Pt C
• Ni D

When sodium metal reacts with alcohols

• Hydrogen gas evolves A
• Sodium hydroxide is obtained B
• Alcohol is reduced C
• Alcohol is polymerised D

Which enzyme is not involved in fermentation of strach

• Diastase A
• Zymase B
• Urease C
• Invertase D

Glucose in the presence of zymase is converted into

• Alcohol A
• Acid B
• Ethyl alcohol C
• Ketone D

If an electrophile attacks then ______ bond breaks first

• C - H A
• O - H B
• C - O C
• None of these D

Which one of the following reacts immediately with conc. HCI in the presence of ZnCI₂

• Primary alcohol A
• Secondary alcohol B
• Tertiary alcohol C
• Ether D

When phenol is reduced in the presence of Zn dust, we get

• Cyclohexene A
• Cyclohexane B
• Benzene C
• Benzyne D

How many alcohol (including both structural isomers and stereoisomers) can have the molecular formula C₄H₁₀O

• 3 A
• 4 B
• 5 C
• 6 D

Which of the following compound is obtained on passing ethanol vapours on heated Al₂O₃?

• Ethylether A
• Acetone B
• Ethane C
• Ethanol D

Which of the following statements is correct?

• Phenol is less acidic than ethyl alcohol A
• Phenol is more acidic than ethanol B
• Phenol is more acidic than carbonic acid C
• Phenol is more acidic than CH₃COOH D

Absolute alcohol is obtained by adding rectified apirit in alcohol:

• Water A
• Na₂CO₃ B
• NaOH C
• CaO D

denaturing of alcohol is done by adding methanol in ethanol:

• 10% A
• 20% B
• 30% C
• 40% D

Phenol gives ---------- Colour with neutral FeCl₃solution

• Violet A
• Green B
• Red C
• Blue D

When phenol is distilled with zinc dust. It is reduced to

• Benzene A
• Benzaldehyde B
• Toluene C
• Hexanol D