ECAT Pre Engineering Chemistry Chapter 22 MCQ Test With Answer

If an electrophile attacks then ______ bond breaks first

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

Which compound is more soluble in water

• C₂H₅OH A
• C₆H₅OH B
• CH₃OCH₃ C
• n-hexanol D

In Lucas test teriary alcohol make an oily layer

• Immediately A
• In 10 mins B
• On heating C
• Not D

Use of ethanol as:

• Drink A
• Solvent and fuel B
• In beverage C
• All of these D

Carbolic acid is the other name for

• Methanol A
• Ethanol B
• Propanol C
• Phenol D

which enzyme is not involved in the fermentation of starch ?

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

Picric acid is

• 2, 4, 6-Trinitrotoluene A
• 2, 4, 6-Tribomoethanol B
• 2, 4,6-Trinitrophenol C
• Para-Nitrophenol D

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

Either, an organic compound has close resemblance in structure and thus a derivative of:

• Water A
• Oxides of lithium B
• Oxides of magnisium C
• Oxides of aluminium D

Which is a reagent for Lucas test

• ZnCl₂+ Conc. HCl A
• Zn B
• Na C
• Br D

Which is possible in ethers?

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

To prepare ethanol by fernentation the optimum temp. is

• 10 - 20°C A
• 25 - 30°C B
• 20°C C
• 35°C D

Which of the following is an isomer of ethanol

• CH₃OCH₃ A
• C₂H₅OC₂H₅ B
• CH₃OH C
• C₂H₅OH D

Which of the following is known as wood spirit

• Ethyl alcohol A
• Propyl alcohol B
• Methyl alcohol C
• Butyl alcohol D

The malt-sugar in the presence of yeast or invertase gives

• Fructose A
• Glucose B
• Lignin C
• Alcohol D

Nitration of phenol gives

• o-nitrophenol A
• p-nitrophenol B
• m-nitrophenol C
• Both o and p-nitrophenol D

Which compound has the maximum repulsion with water?

• C₆H₆ A
• C₂H₅OH B
• CH₃CH₂CH₂OH C
• CH₃----O---CH₃ D

Which of the following is correct?

• Reduction of any aldehyde gives secondary alcohol A
• Reaction of vegetable oil with H₂SO₄gives glycerine B
• Alcoholic iodine with NaOH gives iodoform C
• Sucrose on reaction with NaCl gives invert sugar D

Treatment of a secondary alcohol with a suitable oxidizing agent (K₂Cr₂O₇) results in the formation of

• Ketone A
• Aidehyde B
• Ether C
• Alkyl halide 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

Salol is prepared from

• Salicylic acid and phenol A
• Salicylic acid and methyl alcohol B
• Both C
• None D

A compound is soluble in conc. H₂SO₄, it does not decolourise bromine in carbon tetrachloride but is oxidized by chromic anhydride in aqueous sulphuric acid within two seconds, turning orange solution to blue, green and then opaque. The original compound is

• Primary alcohol A
• Tertiary alcohol B
• alkene C
• ether D

Which the increase in carbon number of solubility of an alcohol

• Increases A
• Decreases B
• Remains unaffected C
• None of these D

95% alcohol is called

• Rectified spirit A
• Spirit of wine B
• Spirit C
• Methylated D

The test used for the detection of ethanol in the mouth of a drunk driver is that the drunk driver is asked to blow air from mouth into a solution of K₂Cr₂O₇and H₂SO₄. The colour changes, if the driver is drunk

• From orange to green A
• From pink to green B
• From orange to colorless C
• From pink to colorless D

Grignard reagent on reaction with a ketone forms

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

Diethyl ether is obtained by Williamsons synthesis using

• Ethanol + Na + C₂H₅Br A
• Ethanol + Mg + C₂H₅Br B
• Methanol + Na + CH₃Br C
• Methanol + Mg + CH₃Br D

Dehydration of ethyl alcohol yields

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

• A primary alcohol A
• A secondary alcohol B
• An eher C
• A phenol D

Oxidation of methyl alcohol gives

• Formaldehyde A
• Acetone B
• Ester C
• Acid D