CBSE Class 12 Chemistry Alcohols Phenol And Ethers Worksheet Set 02

Question. The C — O bond is much shorter in phenol than in ethanol. Give reason.
Answer. Due to resonance C—O bond acquires some partial double bond character.
So, in phenol C—O bond length is smaller than ethanol.

Question. Which of the following isomers is more volatile :
o-nitrophenol or p-nitrophenol?
Answer. o-Nitrophenol is more steam volatile than p-Nitrophenol due to the presence of intramolecular H-bonding. p-nitrophenol shows intermolecular H–bonding.

Question. Give a chemical test to distinguish between 2-propanol and 2-methyl-2-propanol.
Answer. 2-propanol will give yellow precipitate of iodoform on addition of I₂ and NaOH while 2-methyl-2-propanol will not.

Question. Write the equations involved in the following reaction :
Williamson synthesis
Answer. Williamson ether synthesis : Alkyl halide when treated with sodium alkoxide gives dialkyl ether.
C₂H₅ONa + C₂H₅Cl → C₂H₅ — O — C₂H₅ + NaCl

Question. Name the reagents which are used in the following conversions :
(i) A primary alcohol to an aldehyde
(ii) Butan-2-one to butan-2-ol
(iii) Phenol to 2, 4, 6-tribromophenol
Answer. (i) Copper at 573 K
(ii) Sodium borohydride (NaBH₄)
(iii) Bromine water (Br2(_aq))

Q1. What is absolute alcohol ?

Ans: 100% C₂H₅OH is known as absolute alcohol.

Q2. What is rectified spirit ?

Ans:95% C₂H₅OH is known as rectified spirit. 

Q3.Lower alcohols are soluble in water but higher alcohols are not soluble . Why?

Ans: Due to large Hydrocarbon part which hydrophobic.

Q4. Why ether is insoluble in water ?

Ans: Due to absence of HB.

Q5. How is alcohol made unfit for drinking purposes ?

Ans: By adding CH₃OH , CuSO₄ and Pyridine

Q6. Phenol is an acid but does not react with NaHCO3. Why?

Ans: Since Phenol feebly weak in nature.

Q7.Diethylether does not react with Na.Why ?

Ans: Due to absence of acidic Hydrogen (Active).

Q8.Propanol has higher B.P. than that of n-Butane. Why?

Ans : In propanol there is HBonding but in n-Butane there is no HBonding.

Q9. Mixture of o- &p-Nitrophenol is separated by Steam volatile . Why ?

Ans: Due to intramolecular HB in O-Nitrophenol.

Q10. Out ofo- &p-Nitrophenol which one is more volatile ?

Ans:O-Nitrophenol due to intramolecular HB.

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Alcohols And Phenols

Question. What is absolute alcohol ?
Answer: 100% \( \text{C}_2\text{H}_5\text{OH} \) is known as absolute alcohol.

Question. What is rectified spirit ?
Answer: 95% \( \text{C}_2\text{H}_5\text{OH} \) is known as rectified spirit.

Question. Lower alcohols are soluble in water but higher alcohols are not soluble . Why?
Answer: Due to large Hydrocarbon part which hydrophobic.

Question. Why ether is insoluble in water ?
Answer: Due to absence of HB.

Question. How is alcohol made unfit for drinking purposes ?
Answer: By adding \( \text{CH}_3\text{OH} \) , \( \text{CuSO}_4 \) and Pyridine

Question. Phenol is an acid but does not react with NaHCO3. Why?
Answer: Since Phenol feebly weak in nature.

Question. Diethylether does not react with Na.Why ?
Answer: Due to absence of acidic Hydrogen (Active).

Question. Propanol has higher B.P. than that of n-Butane. Why?
Answer: In propanol there is HBonding but in n-Butane there is no HBonding.

Question. Mixture of o- & p-Nitrophenol is separated by Steam volatile . Why ?
Answer: Due to intramolecular HB in O-Nitrophenol.

Question. Out of o- & p-Nitrophenol which one is more volatile ?
Answer: O-Nitrophenol due to intramolecular HB.

Question. IUPAC Name of Dimethylether is -
Answer: Methoxymethane

Question. IUPAC Name of Isobutyl alcohol is-
Answer: 2-Methylpropanol

Question. What is anisol ?
Answer: Methyl phenyl ether

Question. Give an example of 3o alcohol.
Answer: Dimethylethanol

Question. What is phenetol ?
Answer: Ethylphenyl ether(\( \text{C}_6\text{H}_5\text{-O-C}_2\text{H}_5 \))

Question. Phenol gives litmus test but not alcohol. Why?
Answer:

Question. What is Lucas Reagent ?
Answer: Anhydrous Zinc Chloride +Conc.HCl

Question. Dimethyl ether is more volatile than ethanol . Why?
Answer: Due to absence of HB.

Question. Which product will obtain by dehydration of ethanol ?
Answer: Ethene.

Question. Out of But-2-en-1-ol and 2-Butanol which one shows Cis&Trans isomerism ?
Answer: But-2-en-1-ol will show Cis&Trans isomerism .

Chapter 12: 1 Marks Questions

Question. Write IUPAC Name of Acetone .
Answer: Propanone

Question. Draw the structure of -Isobutyraldehyde.
Answer: \( \text{CH}_3\text{-CH(CH}_3\text{)-CH}_2\text{-CHO} \)

Question. Write the IUPAC Name of Caproic Acid.
Answer: Hexanoic Acid.

Question. What is Fehling’s Solution ‘A’?
Answer: Aqueous solution of \( \text{CuSO}_4 \).

Question. What is the Tollen’s Reagent?
Answer: Ammonical Silver Nitrate Solution .

Question. Arrange the following compounds in the increasing order of their B.P. CH3CHO,CH3CH2OH,CH3OCH3,CH3CH2CH3
Answer: \( \text{CH}_3\text{CH}_2\text{CH}_3 < \text{CH}_3\text{OCH}_3 < \text{CH}_3\text{CHO} < \text{CH}_3\text{CH}_2\text{OH} \)

Question. Arrange the following compounds in the increasing order of their reactivity in nucleophilic Addition reaction Ethanal,Propanal,Propanone,Butanone
Answer: Butanone < Propanone < Propanal < Ethanal

Question. Write the structure of 3-Hydroxy butanal.
Answer: \( \text{CH}_3\text{-CH(OH)-CH}_3\text{-CHO} \)

Question. B.P. of ketone&aldehyde is higher than that of hydrocarbons of comparable molecular mass why?
Answer: Due to dipole-dipole interaction in carbonyl compounds.

Question. What is formalin ?
Answer: 40% aqueous solution of \( \text{HCHO} \).

Question. What is Vinegar?
Answer: 8% solution of acetic acid.

Question. Formic Acid is more acidic than acetic acid why?
Answer: Due to +I effect in acetic acid

Question. What is Per-Fluoro acetic acid?
Answer: \( \text{CF}_3\text{COOH} \)

Question. Acidic nature of carboxylic acid is higher than Phenol Why?
Answer: Carboxylate ions are more stable than Phenoxide ions .

Question. Out of Propionaldehyde and Acetone , which more reactive ?
Answer: Acetone

Question. What is Schiff’s base ?
Answer: \( \text{RCH=NR'} \)

Question. Out of CH3CHO&HCHO which compound will give aldol condensation ?
Answer: \( \text{CH}_3\text{CHO} \)

Question. Out of CH3CHO&HCHO which compound will give Cannizzaro’s Reaction ?
Answer: \( \text{HCHO} \)

Question. Write oxidation product of Propanol.
Answer: Propanoic Acid

Question. What is PCC?
Answer: PyridiniumChloroChromate

Chapter 13: 1 Marks Questions

Question. Give an example tertiary amine .
Answer: Trimethyl amine

Question. Write the IUPAC Name of ethyl amine
Answer: Ethanamine

Question. Which amine is more basic CH3NH2or(CH3)3N in Gaseous Phase ?
Answer: \( (\text{CH}_3)_3\text{N} \)

Question. What is the Zwitterion ?
Answer: Dipolar ion

Question. Give an example of Zwitter ion.
Answer: \( \text{H}_3\text{N}^+\text{-CH}_2\text{-COO}^- \)

Question. Write the IUPAC Name of CH2=CHCN.
Answer: Pro-2-enenitrile

Question. Give one important use of Phenyl isocyanide .
Answer: As insecticide

Question. B.P. of 1o Amine is higher than that of secondary amine of comparable molecular mass why?
Answer: Due to more Number of HB.

Question. Ethyl amine is soluble in water but Aniline does not why?
Answer: Due to HB in Ethyl amine

Question. Which amine gives Carbyl amine test ?
Answer: Primary(\( 1^\circ \)) Amine

Question. Write the IUPAC Name of (CH3)3N.
Answer: N,N-Dimethylmethanamine

Question. Arrange the following in the decreasing order of basic strength. C6H5NH2 ,(C2H5)2NH,C2H5NH2,NH3
Answer: \( (\text{C}_2\text{H}_5)_2\text{NH} > \text{C}_2\text{H}_5\text{NH}_2 > \text{NH}_3 > \text{C}_6\text{H}_5\text{NH}_2 \)

Question. Aniline is less basic than ammonia why?
Answer: Due to +R effect in Aniline

Question. Why are aliphatic amines stronger bases than aromatic amines ?
Answer: There is +I effect in aliphatic amines and -I effect in aromatic amines.

Question. Write the IUPAC Name of -
Answer: 2-Methylaniline

Question. Which is more basic triethyl amine or Diethyl amine in Gaseous state ?
Answer: Diethyl amine

Question. Which of followings have higher Kb , H2O or NH3?
Answer: \( \text{NH}_3 \)

Question. Write the structure of Benzenediazonium chloride.
Answer: \( \text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- \)

Question. What is Hinsberg’s Reagent ?
Answer: Bezenesulphonyl Chloride (\( \text{C}_6\text{H}_5\text{SO}_2\text{Cl} \))

Question. Give an example of primary aliphatic amine.
Answer: \( \text{CH}_3\text{NH}_2 \)

Question. Write the structure of p- Amino azobenzene.
Answer: p-Aminoazobenzene (yellow dye)

Chapter 14: 1 Mark Question

Question. What is invert sugar ?
Answer: Mixture of glucose & Fructose

Question. Which disaccharide is present in milk ?
Answer: Lactose

Question. Which Polysaccharide is present in Rice ?
Answer: Starch

Question. Write hydrolysis product of Lactose.
Answer: Glucose & Galactose

Question. Name the carbohydrate which is not digested in human body ?
Answer: Cellulose

Question. Which Functional groups are present in glucose ?
Answer: -OH & CHO

Question. What are the constituents of Maltose ?
Answer: 2 Units of \(\alpha\)-D-glucose

Question. What are the constituents of Starch ?
Answer: Amylose & Amylopectin

Question. Which Polysaccharide is stored in the Liver of Animals ?
Answer: Glycongen

Question. Name two Carbohydrades which act as byfuels?
Answer: Starch & Glycongen

Question. Write the water soluble vitamins .
Answer: Vitamin B & Vitamin C

Question. Give an example of Fibrous Protein .
Answer: Keratin

Question. Give two examples of essential amino acids .
Answer: Valine & Lycine

Question. Name the Enzymes present in the saliva of Human.
Answer: Amylase

Question. What is Glycogen ?
Answer: Polysaccharide

Question. What type of bonding occurs in globular Proteins ?
Answer: Van der Waal’s interaction , Dipolar interaction , HB.

Question. Which bio-molecules act as catalyst ?
Answer: Enzyme

Question. Name the enzyme which breaks proteins into peptides ?
Answer: Pepsin & Trypsin

Question. Name the purines present in DNA >
Answer: Adenine and Guanine

Question. Name the base that is found in RNA only .
Answer: Uracil

Chapter 15: 1 Mark Questions

Question. Write the monomers of Bakelite.
Answer: Phenol & Formaldehyde

Question. Give the chemical name of Tefflon.
Answer: PTFE

Question. What is the main constituent of Babalgum ?
Answer: Butadiene & Sytrene

Question. Name a synthetic polymer which is an amide ?
Answer: Nylon-66

Question. Name a polymer used to make cups for hot drinks?
Answer: Urea formaldehyde resin

Question. Name one thermosetting & one thermoplastic polymer>
Answer: PVC & Bakelite

Question. Name a synthetic polymer which is an ester.
Answer: Terrylene

Question. Give an example of Step -Growth Polymer .
Answer: Terrylene

Question. Write the monomers of Neoprene
Answer: Chloroprene

Question. Write monomers of Nylon-66
Answer: Hexamethylenediamine & Adipic acid

Question. Write the Full form of PMMA.
Answer: PolyMethylMethAcrylate

Question. What is the volcanisation ?
Answer: Heating of natural rubber with sulphur .

Question. What is PHBV?
Answer: Poly-\(\beta\)-hydroxybutyrate-Co-\(\beta\)-hydroxyvalerate

Question. Give an example of Bio-degradable polymer ?
Answer: PHBV

Question. What do you hy Buna-S ?
Answer: Butadiene & Styrene

Question. Arrange the following Polymers in increasing order of intermolecular force. Nylon-66,Buna-S,Polythene
Answer: \( \text{Buna-S} < \text{Polythene} < \text{Nylon-66} \)

Question. Name a polymer used in non-stick utensils.
Answer: Tefflon

Question. What do you understand for 6&6 in Nylon -66 ?
Answer: Both 6 shows number of carbon atoms in monomers.

Question. What do you mean by Bu- , na& N in Buna-N.
Answer: Bu-Butadiene ,na-Sodium (Na) and N- Acrylonitrile

Question. Write the monomers of Melamin Formaldehyde Resin.
Answer: Melamin & Formaldehyde

Chapter 16: 1 Mark Questions

Question. Name two types of chemical messangers.
Answer: Neurotransmitters & Hormones

Question. Name the antibiotic used in typhoid fever.
Answer: Chloramphenicol

Question. Name a Broad spectrum Antibiotic.
Answer: Chloramphenicol

Question. Name the Medicine which can act as analgesic as well as antipyretic .,
Answer: Aspirin

Question. Name the constituents of Dettol.
Answer: Chlroxylenol & terpineol

Question. Why is Ethanal added to Soap ?
Answer: To make it transparent

Question. Name an ant acid which prevent the formation of acid in the stomach.
Answer: Ranitidine

Question. Why is glycerol is added to shaving soap?
Answer: To prevent rapid drying.

Question. Give an example of bacteriocidal antibiotic.
Answer: Penicillin

Question. Name a drug used in mental depression .
Answer: Equanil

Question. Name a few artificial sweatners
Answer: Saccharin & Aspartame

Question. What type drugh is phenacetine?
Answer: Antibiotic

Question. What are pathogens?
Answer: Disease causing organisms.

Question. Name two Narcotics which are used as analgesics >
Answer: Morphine & Codeine

Question. What is Chemotherapy?
Answer: Use of chemical for treatment of disease .

Question. Mention a few drug targets .
Answer: Carbohydratyes, Lipids , Proteins & Nucleic Acids .

Question. Define a Tanquilizer.
Answer: Drug which act on CNS to help in reducing anxiety.

Question. Define Soap .
Answer: Soap is a Sodium or Potassium salt of Fatty Acids

Question. Why are detergents preferred over soaps ?
Answer: Unlike soaps detergents can be used even in hard water.

Question. What is a Bacteriostatic drug ?
Answer: A drug which inhibit the growth of disease causing organisms.