CBSE Questions for Class 12 Engineering Chemistry Alcohols,Phenols And Ethers Quiz 4 - MCQExams.com

Alcohols containing only up to ________________ carbon atoms are completely miscible with water.
  • 10
  • 3
  • 8
  • 14
Which of the following is used in the manufacture of ethanol?
  • $$C_2H_6$$
  • $$C_2H_2$$
  • $$CH_4$$
  • $$C_2H_4$$
The boiling point of 95% ethanol is higher than that of absolute ethanol.
  • True
  • False
The solubility of alcohols in water gradually increases with molecular weight.
  • True
  • False
The distillation of rectified spirit gives absolute ethanol.
  • True
  • False
Which of the following can not be formed by hydrolysis of alkenes?
  • Methanol
  • Ethanol
  • Propanol
  • None of these
Melting point of phenol is:
  • $$95^0$$C
  • $$43^0$$C
  • $$20^0$$C
  • $$10^0$$C
In the reaction, $$C_2H_5OH \xrightarrow[300^oC]{Cu} X$$ the molecular formula of X is:
  • $$C_4H_6O$$
  • $$C_4H_{10}O$$
  • $$C_2H_4O$$
  • $$C_2H_6$$
Phenol reacts with alkali to give:
  • salt
  • water
  • both A and B
  • complex compound
Hydrogen chloride and $$SO_2$$ are the side products in the reaction of ethanol with thionyl chloride. Which of the following is the main product in this reaction?
  • $$C_2H_5OC_2H_5$$
  • $$C_2H_6$$
  • $$CH_3Cl$$
  • $$C_2H_5Cl$$
What type of spectroscopy would be the best tool to analyze a clear and colorless solution for the presence of a functional group like an alcohol group $$(-OH)$$?
  • UV spectroscopy.
  • IR spectroscopy.
  • Mass spectroscopy.
  • Photoelectron spectroscopy.
Phenol is a:
  • crystalline solid
  • amorphous solid
  • volatile liquid
  • nonvolatile liquid
What are X and Y respectively in the following reaction?
$$\displaystyle X \xrightarrow[]{PBr_3} C_2H_5Br \xrightarrow[\Delta]{AgOH}Y$$
  • $$CH_3OH, C_2H_6$$
  • $$C_2H_5OH, C_2H_5AgBr$$
  • $$CH_3COOH, CH_3CH_2OH$$
  • $$C_2H_5OH, C_2H_5OH$$
An industrial method for the preparation of methanol is:
  • by catalytic reduction of carbon monoxide
  • by reacting methane with steam in presence of a catalyst
  • by reduction of $$HCHO$$ with $$LiAlH_4$$
  • by reduction of $$HCHO$$ with aqueous $$NaOH$$
Methanol can be prepared when :
  • iodomethane is heated with moist silver oxide
  • iodomethane react with sodium in the presence of ether
  • both A and B
  • none of these
Reagents used for industrial preparation of methanol are:
  • $$CO+H_2$$
  • $$HCHO+H_2$$
  • $$CO_2+H_2$$
  • $$HCOOH+H_2$$
Dehydration of alcohol is an example of which type of reaction?
  • Substitution
  • Elimination
  • Addition
  • Both $$B$$ and $$C$$

The IUPAC name of:
582585.png
  • 2, 1-dimethyl-1, 3-butanol
  • 4,4-dimethyl-2-pentanol
  • 4-methyl-2, 4-pentanol
  • 1, 3, 3-trimethyl-1, 3-propanol
Common name for methanol is:
  • volemitol
  • rubbing alcohol
  • wood spirit
  • xylitol
Which of the following compound is most acidic?
  • $$Cl-CH_2-CH_2-OH$$
Destructive distillation of wood in the laboratory will result in the formation of :
  • Ethanol
  • Methane
  • Methanol
  • Butane
In Williamson's synthesis, ethoxy ethane is prepared by:
  • heating sodium ethoxide with ethyl bromide
  • passing ethanol over heated alumina
  • treating ethyl alcohol with excess of conc. $$H_{2}SO_{4}$$ at $$430-440\ K$$
  • heating ethanol with dry $$Ag_{2}O$$
The other name for Syngas is:
  • Producer gas
  • Water gas
  • Tear gas
  • Fuel gas
Methanol is called as Marine Methanol beacuse:
  • it is an essential compound for marine life
  • it is mostly obtained from deep sea bed
  • it is used as a marine fuel
  • it serves as a signal indicator for big ships on burning
Methanol is a:
  • yellow coloured liquid
  • brown coloured liquid
  • colourless liquid
  • blue coloured liquid
Identify the correct set representing properties of Methanol.
  • Colourless, volatile, poisonous, miscible
  • Colourless, volatile, non-poisonous, miscible
  • Colourless, volatile, poisonous, immiscible
  • Colourless, non-volatile, poisonous, miscible
There are two samples $$A$$ and $$B$$. $$A$$ is Methanol and $$B$$ is Ethanol. Both are heated both at the same rate in closed container separately. Which one is correct about the above test?
  • At $$60^0$$C, container $$A$$ and $$B$$ both have liquids in them
  • At $$80^0$$C, container $$A$$ and $$B$$ both have vapours in them
  • At $$70^0$$C, container $$B$$ has liquid and $$A$$ has vapours
  • All the above
What is the $$IUPAC$$ name of the following compound?

$$CH_{3} - CH_{2} - CH_{2} - OH$$
  • Propan-1-ol
  • Propan-2-ol
  • Propane-1-ol
  • Ethane-2-ol
Which of the following order is true regarding the acidic nature of phenol?
  • Phenol $$>$$ O -cresol $$>$$ O-nitrophenol
  • Phenol $$>$$ O -nitrophenol $$>$$O-cresol
  • O-cresol $$<$$ phenol $$<$$ O- nitrophenol
  • Phenol $$<$$ O-cresol $$<$$ O-nitrophenol
Which of the following compounds has lowest boiling point ? 
  • n-butyl alcohol
  • Isobutyl alcohol
  • Tert-butyl alcohol
  • Sec-butyl alcohol
Among i-iii the boiling point follows the order.
632908_9d72350a0e52480c996091963822d1e1.png
  • $$ii < i < iii$$
  • $$iii < ii < i$$
  • $$i < ii < iii$$
  • $$ii < iii < i$$
Which of the following alcohol has highest solubility in water ?
  • Tertiary butyl alcohol
  • Secondary butyl alcohol
  • Ethylene glycol
  • Glycerol
When alkyl halide is heated with dry $${ Ag }_{ 2 }O$$, it produces:
  • ester
  • ether
  • ketone
  • alcohol
What is the formula of tertiary butyl acohol?
  • $$CH_{3} - CH(CH_{3}) - CH_{2} - OH$$
  • $$CH_{3} - (CH_{2})_{2}OH$$
  • $$CH_{3} - CH(OH) - CH_{2} - CH_{3}$$
  • $$(CH_{3})_{3}  C - OH$$
Which of the following is most soluble in water ?
  • n- butyl alcohol
  • Iso-butyl alcohol
  • Tertiary butyl alcohol
  • None of the above
Dehydration of alcohol is an example of which type of reaction ?
  • Substitution reaction
  • Elimination reaction
  • Rearrangement reaction
  • Addition reaction
Consider the given reaction:
$$\displaystyle CH_3-CH=CH-CH_2-OH \overset{HBr}{\underset{S_N 1}{ \longrightarrow}} [P]$$

In the given reaction the product $$[P]$$ is:
  • $$CH_3-CH=CH-CH_2-Br$$
  • $$CH_3 - \!\!\overset{\,\,\,Br}{\overset{|}{C}}\!\!H - CH = CH_2$$
  • $$CH_2=CH-CH=CH_2$$
  • $$CH_3 - \overset{\,\,\,Br}{\overset{|}{C}}\!\!H - CH_2 - CH_2 - OH$$
In which of the following reactions of alcohol there is no cleavage of C-O bond ?
  • Dehydration reaction of alcohol
  • Oxidation reaction of alcohol
  • Reduction reaction of alcohol
  • Reaction of alcohol with phosphorus tribromide
What is the hybridisation of carbon and oxygen in electronic structure of ether?
  • $$sp^{3}$$ and $$sp^{2}$$
  • $$sp^{3}$$ and $$sp^{3}$$
  • $$sp$$ and $$sp$$
  • $$sp^{2}$$ and $$sp^{2}$$
Which is the only alcohol that can be prepared by the indirect hydration of alkene?
  • Ethyl alcohol

  • Propyl alcohol
  • Isobutyl alcohol
  • Methyl alcohol
Which of the following statement is not correct ?
  • Phenol is neutralised by sodium carbonate
  • Phenol is used to prepare analgesic drugs
  • Solubility of phenol in water is more than that of chlorobenzene
  • Boiling point of o-nitrophenol is lower than that of p-nitrophenol
Which of the following represents monohydric alcohol?
  • $$C_nH_{2n}OH$$
  • $$C_nH_{2n+1}OH$$
  • $$C_nH_{n}O$$
  • $$C_nH_{n}OH$$
In the above reaction, the product $$(X)$$ is:
770818_e752457a72084c4ca6996965c3b57335.png
Which of the following compounds decolourizes aqueous bromine and gives white fumes of $$HCl$$ on reaction with $$PCl_{5}$$?
  • $$CH_{3}COCH_{2}CH - CH_{2}$$
  • $$CH_{3}CH_{2}CH_{2}CH_{2}CH_{3}$$
  • $$CH_{3}CH = CHCH_{2}CH_{2}OH$$
  • $$CH_{3}OCH_{2}CH_{2}CH_{2}CH_{2}OH$$
An alcohol of molecular formula $$C_5H_{14}OH$$ on dehydration gives an alkene, which on oxidation yields a mixture of ketone and an acid. The alcohol is:
  • $$CH_3CH_2CH(OH)CH_2CH_3$$
  • $$CH_2-\underset{\underset{OH}{|}}CHCH_2CH_2CH_3$$
  • $$(CH_3)_2CHCH(OH)CH_3$$
  • $$(CH_3)_3CCH_2OH$$
$$A$$ and $$B$$ respectively are:
711507_ab2e6854643e48bf9faa08f924db27b6.png

The order of reactivity of the following alcohols towards conc. $$HCl$$ is:
705495_1260a2a487884efea65b06dc18bd6188.png
  • $$I> II> III> IV$$
  • $$I> III> II> IV$$
  • $$IV> III> II> I$$
  • $$IV> III> I> II$$
Which one of the following phenols is the strongest acid? 
Among the compound I-IV, the compound having the lowest boiling point is 
781268_d4212fbb098341838c7c3b87da50af9d.png
  • I
  • II
  • III
  • IV
The IUPAC name for the compound given below is:
782211_2f81d479606e416da81fd53f8a14b95b.jpg
  • $$(2R, 3Z)$$ - 7 - phenylhept - 3- en - 2 - ol
  • $$(2S, 3Z)$$ - 7 - phenylhept - 3- en - 2 - ol
  • $$(2R, 3E)$$ - 7 - phenylhept - 3- en - 2 - ol
  • $$(2S, 3E)$$ - 7 - phenylhept - 3- en - 2 - ol
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