CBSE Class 12 Chemistry Alcohols Phenols And Ethers Worksheet Set B

Question. The reaction of ethylene glycol with PI₃ gives:
a. ICH₂CH₂I
b. CH₂ == CH₂
c. CH₂ = CHI
d. ICH = CHI
Answer : B

Question. During dehydration of alcohols to alkenes by heating with conc. H₂SO₄ the initiation step is:
a. Protonation of alcohol molecule
b. Formation of carbocation
c. Elimination of water
d. Formation of an ester
Answer : A

Question. Which of the following product is formed, when ether is exposed to air?
a. Oxide
b. Alkanes
c. Alkenes
d. Peroxide of diethyl ether
Answer : D

Question. Ethyl alcohol on oxidation with K₂Cr₂O₇ gives:
a. Acetic acid
b. Acetaldehyde
c. Formaldehyde
d. Formic acid
Answer : A

Question. Lucas test is used for:
a. Alcohols
b. Amines
c. Diethyl ether
d. Glacial acetic acid
Answer : A

Question. Phenol is:
a. A weaker base than NH₃
b. Stronger than carbonic acid
c. Weaker than carbonic acid
d. A neutral compound
Answer : C

Question. Primary and secondary alcohols on action of reduced copper give:
a. Aldehydes and ketones respectively
b. Ketones and aldehydes respectively
c. Only aldehydes
d. Only ketones
Answer : A

Question. Methyl alcohol on oxidation with acidified K₂Cr₂O₇ gives:
a. CH₃COCH₃
b. CH₃CHO
c. HCOOH
d. CH₃COOH
Answer : C

Question. Phenol is less acidic than:
a. Ethanol
b. Methanol
c. o-nitrophenol
d. p-methylphenol
Answer : C

Question. Primary alcohols on dehydration give:
a. Alkenes
b. Alkanes
c. Both a. and b.
d. None of these
Answer : A

Question. When phenol reacts with ammonia in presence of ZnCl₂ at 300°C, it gives?
a. Primary amine
b. Secondary amine
c. Tertiary amine
d. Both (b) and (c)
Answer : A

Question. An organic compound X on treatment with acidified K₂Cr₂O₇ gives a compound Y which reacts with I₂ and sodium carbonate to form tri-odomethane. The compound X is?
a. CH₃OH
b. CH₃ − CO −CH₃
c. CH₃CHO
d. CH₃CH(OH)CH₃
Answer : D

Question. The reaction of conc. HNO₃ and phenol forms:
a. Benzoic acid
b. Salicylic acid
c. o-and p-nitrophenol
d. Picric acid
Answer : D

Question. The compound which gives the most stable carbonium ion on dehydration is?

Answer : B

Question. Propene, CH₃ −CH = CH₂ can be converted to 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion?
a. Alkaline KMnO₄
b. B₂H₆ and alkaline H₂O₂
c. O₃ / Zn dust
d. OsO₄ /CH₂ ,Cl₂
Answer : B

Question. At low temperature phenol reacts with Br₂ in CS₂ to form:
a. m-bromophenol
b. o-and p-bromophenol
c. p-bromophenol
d. 2, 4, 6-tribromophenol
Answer : B

Question. The compound ‘A’ when treated with ceric ammonium nitrate solution gives yellow ppt. The compound ‘A’ is?
a. Alcohol
b. Aldehyde
c. Acid
d. Alkane
Answer : A

Question. Phenol at 25ºC is:
a. A white crystalline solid
b. A transparent liquid
c. A gas
d. Yellow solution
Answer : A

Question. By distilling glycol with fuming sulphuric acid, which of following is obtained?
a. Glycerol
b. Pinacol
c. Dioxan
d. Ethylene oxide
Answer : C

Question. Oxidation of ethanol by chromic acid forms:
a. Ethanol
b. Methanol
c. 2-propanone
d. Ethanoic acid
Answer : D

Question. Methanol and ethanol are miscible in water due to:
a. Covalent character
b. Hydrogen bonding character
c. Oxygen bonding character
d. None of these
Answer : B

Question. Coconut oil upon alkaline hydrolysis gives:
a. Glycol
b. Alcohol
c. Glycerol
d. Ethylene oxide
Answer : C

Question. In the commercial manufacture of ethyl alcohol from starchy substances by fermentation method, which enzymes stepwise complete the fermentation reaction?
a. Diastase, maltase and zymase
b. Maltase, zymase and invertase
c. Diastase, zymase and lactase
d. Diastase, invertase and zymase
Answer : A

Question. Butanal is an example of:
a. Primary alcohol
b. Secondary alcohol
c. Aliphatic aldehyde
d. Aliphatic ketone
Answer : C

Question. Methylated spirit is:
a. Methanol
b. Methanol + ethanol
c. Methanoic acid
d. Methanamide
Answer : B

Question. Which of the following is dihydric alcohol?
a. Glycerol
b. Ethylene glycol
c. Catechol
d. Resorcinol
Answer : B

Question. According to Lewis concept of acids and bases, ether is:
a. Acidic
b. Basic
c. Neutral
d. Amphoteric
Answer : B

Question. Ethanol is prepared industrially by:
a. Hydration of ethylene
b. Fermentation of sugars
c. Both the above
d. None of these
Answer : C

Question. Ethyl alcohol is industrially prepared from ethylene by:
a. Permanganate oxidation
b. Catalytic reduction
c. Absorbing in H₂SO₄ followed by hydrolysis
d. Fermentation
Answer : C

Question. If formaldehyde and potassium hydroxide are heated, then we get:
a. Acetylene
b. Methane
c. Methyl alcohol
d. Ethyl formate
Answer : C

 

 

Please click on below link to download CBSE Class 12 Chemistry Alcohols Phenols And Ethers Worksheet Set B