HOTs Alcohols Phenols and Ethers Class 12 Chemistry

Please refer to Alcohols Phenols and Ethers HOTs Class 12 Chemistry provided below with Alcohols Phenols and Ethers. All HOTs for Class 12 Chemistry with answers provided below have been designed as per the latest syllabus and examination petter issued by CBSE, NCERT, KVS. Students of Standard 12 Chemistry should learn the solved HOTS for Class 12 Chemistry provided below to gain better marks in examinations.

Alcohols Phenols and Ethers Class 12 Chemistry HOTs

MULTIPLE CHOICE QUESTIONS (MCQs)

Question. Which of the following alcohol is most soluble in water
(a) Propanol
(b) Hexanol
(c) Pentanol
(d) Butanol

Question. Which one of the following compound is obtained by dehydrogenation of secondary alcohols?
(a) Ketone
(b) Aldehyde
(c) Carboxylic acid
(d) Amine

Question. Ethyl alcohol obtained by fermentation of starch is called wash and what is its purity?
(a) 15%
(b) 99%
(c) 99.9%
(d) 95%

Question. What is the IUPAC name of Vinyl alcohol ?
(a) Ethanol
(b) Methanol
(c) Ethenol
(d) Methenol

Question. Which is most acidic
(a). Phenol
(b). 4-nitrophenol
(c). Cresol
(d). 2-nitrophenol

Question. The reaction of carboxylic acid and alcohol catalysed by conc.H₂SO₄ is called ?
(a) Dehydration
(b) Saponification
(c) Esterification
(d) Neutralisation

Question. Catalytic dehydrogenation of a primary alcohol gives a
(a) Ketone
(b) Aldehyde
(c) Sec . alcohol
(d) Ester

Question. Which of the following is more acidic than alcohol ?
(a) Phenol
(b) Cyclohexanol
(c) Benzyl alcohol
(d) Ethenol

Question. Which chemical is used to distinguish between phenol and benzyl alcohol.
(a) NaHCO₃
(b) FeCl₃
(c) Iodoform test
(d) none of the above

Question. On heating aqueous solution of benzene diazonium chloride , which of the following is formed
(a) benzene
(b) chloro benzene
(c) phenol
(d) aniline

ASSERTION – REASONING QUESTIONS

A statement of assertion is followed by a statement of reason. Mark the correct choice from the options given below :
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false.

Question. Assertion : o – Nitrophenol and p – Nitrophenol are separated by steam distillation.
Reason : o-Nitrophenol has intramolecular H – bonding while molecules of p-nitrophenol are linked by intermolecular H – bonding.

Question. Assertion : Phenol is acidic in nature.
Reason : Phenate ion is less resonance stabilised than phenol.

Question. Assertion : Phenols do not react with phosphorus halides while alcohols do not react.
Reason : In phenols C-O bond has partial double bond character due to resonance while it is not so in alcohols.

Question. Assertion : Methyl alcohol is a weaker acid than water.
Reason : Among the aliphatic monohydric alcohols, methyl alcohol is the strongest acid.

One – word answer

Question.  Name a compound which can be used as an anesthetic in surgery ?
Answer. Ethrane

Question. In Williamson synthesis , which type of halide should not be used ?
Answer. Tertiary alkylhalide

VERY SHORT ANSWER TYPE QUESTIONS 

Question. Write IUPAC name of the following compound :

Answer. 2,5-Dimethylhexane-1, 3 diol.

Question. How is phenol obtained from aniline ?
Answer.

Question. Why phenol is acidic in nature ?
Answer. Due to stability of phenoxide ion by resonance.

Question. Arrange the following in decreasing order of their acidic character :

Answer. (iii) > (ii) > (i)

Question. Among HI, HBr and HCl, HI is most reactive towards alcohols. Why ?
Answer. Due to lowest bond dissociation energy of HI.

Question. Name a compound which is used as antiseptic as well as disinfectant.
Answer. Solution of phenol : 0.2% antiseptic, 2% disinfectant.

Question. What is nitrating mixture ?
Answer. Conc. (H₂SO₄ + HNO₃)

Question. Lower alcohols are soluble in water, higher alcohols are not. Why ?
Answer. Due to formation of hydrogen bonds.

Question. What happens when CH₃CH₂OH heated with red P and HI ?
Answer.

Question. Complete the following reaction :

Answer.

2, 4, 6-Trinitro phenol (Picric acid)

Question. Ethanol has higher boiling point than methoxy methane. Give reason.
Answer. Because of H-bonds.

Question. How could you convert ethanol to ethene ?
Answer.

Question. Explain Kolbe’s reaction with example.
Answer.

Question. Which of the following isomer is more volatile :
o-nitrophenol or p-nitrophenol
Answer. o-nitrophenol.