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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 12
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Q.1
Formula for vinyl alcohol is ....
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a) CH2=CHOH
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b) C6H5CHOCH3
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c) CH2-CHCH2OH
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d) CH2COCH3
Explanation
Answer : (a)
Q.2
Which of the following reagents can convert acetic acid into ethanol?
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a) Sn + HCl
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b) LiAlH4 + ether
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c) H2 + Ni
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d) Na + alcohol
Explanation
Answer : (b)
Q.3
1-phenyl ethanol can be prepared from benzaldehyde by the action of
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a) CH3Br and AlBr3
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b) CH3Br
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c) CH3I, Mg and HOH
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d) C2H5I and Mg
Explanation
Answer : (c)
Q.4
Which of the following methods cannot be used for the preparation of an ester?
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a) RCOCl + R'OH + Pyridine
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b) (RCO)2O + R'OH + Pyridine
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c) RCOOH + R'OH + H+
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d) RCOOH + R'OH + OH-
Explanation
The esterification by RCOOH and R'OH does not take place in alkaline medium Answer : (d)
Q.5
Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI
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a) CH3CH2-O-CH3
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b)
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c)
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d) CH3 - O - CH3
Explanation
Answer : (c)
Q.6
Which of the following can work as dehydrating agent for alcohols?
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a) H2SO4
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b) H3PO4
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c) Al2O3
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d) All of these
Explanation
Answer : (d)
Q.7
The alcohol that forms fats with fatty acids is .... ...
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a) ethanol
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b) methanol
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c) glycerol
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d) glycol
Explanation
Answer : (c)
Q.8
An alcohol on alk. KMnO4 oxidation gives first acetone and on further oxidation acetic acid. It is
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a) ethyl alcohol
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b) primary alcohol
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c) isopropyl alcohol
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d) none of these
Explanation
Answer : (c)
Q.9
Ethyl alcohol is industrially prepared from the ethylene by .... ....
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a) fermentation
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b) permanganate oxidation
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c) catalytic reduction
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d) absorbing in sulphuric acid followed by hydrolysis
Explanation
Answer : (d)
Q.10
Lucas reagent is used to distinguish among primary, secondary and tertiary
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a) aromatic amines
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b) alcohols
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c) alkyl halides
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d) aliphatic amines
Explanation
Answer : (b)
Q.11
Glycol on oxidation with .... gives oxalic acid
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a) HIO4
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b) acidic KMnO4
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c) acidic K2Cr2O7
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d) nitric acid
Explanation
Answer : (d)
Q.12
An industrial method of preparation of methanol is
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a) by reacting gormaldehyde with aqueous sodium bydroxide solution
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b) by reacting methane with steam at 900°C with a nickel catalyst
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c) catalytic reduction of carbon monoxide in presence of ZnO-Cr2O3
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d) by reacting formaldehyde with lithium aluminium hydride
Explanation
Answer : (c)
Q.13
The compound with formula C4H10O yields a compound C4H8O on oxidation. The compound C4H10O is
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a) an anhydride
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b) an aldehyde
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c) a ketone
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d) an alcohol
Explanation
Answer : (d)
Q.14
Methyl alcohol reacts with phosphorous trichloride to form .... ....
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a) methyl chloride
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b) dimethyl ether
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c) methane
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d) acetyl chloride
Explanation
PCl5 replaces -OH group by Cl Answer : (a)
Q.15
HBr reacts fastest with
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a) propan-1-ol
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b) propan-2-ol
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c) 2-methylpropan-2-ol
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d) 2-methylpropan-1-ol
Explanation
-OH group is more reactive in tertiary alcohol Answer : (c)
Q.16
Which of the following are known as mercaptans?
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a) Thio-ethers
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b) Thio-acids
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c) Thio-alcohols
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d) Thio-aldehyde
Explanation
R - SH are thiols or mercaptans Answer : (c)
Q.17
Assertion:Phenol is more reactive than benzene towards electrophilic substitution reaction Resaon:In case of phenol, the intermediate carbocation is more resonance stabilised
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (a)
Q.18
RCH2CH2OH can be converted to RCH2CH2COOH by the following sequence of steps
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a) HCN, PBr3, H3O+
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b) KCN, H3O+
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c) PBr3, KCN, H2/Pt
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d) PBr3, KCN, H3O+
Explanation
Answer : (d)
Q.19
Under drastic conditions all the alcohols can be oxidized to carboxylic acids but the following alcohols give carboxylic acids having same number of carbon atoms
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a) primary
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b) secondary
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c) tertiary
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d) none of these
Explanation
daratic oxidation of secondary alcohol give carboxylic acid with one carbon less while tertiary give two carbon less Answer : (a)
Q.20
on Q350) The compound B formed in the following sequence of reactions,
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a)propanal
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b) propane
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c) propyne
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d) propene
Explanation
A is CH3CH2CH2Cl; B is CH3.CH = CH2 Answer : (d)
Q.21
When glycerol is treated with excess of HI, it produces ... ...
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a) allyl iodide
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b) propene
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c) glycerol tri-iodide
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d) 2-iodopropane
Explanation
Answer : (d)
Q.22
Propene, CH3 - CH = CH2 can be converted into 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion
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a) H2O2
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b) B2H6, H2O2
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c) H2SO4
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d) None of these
Explanation
Process is called hydroboration Answer : (b)
Q.23
Iso propyl alcohol and n-propyl alcohols are .... ....
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a) position isomers
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b) functional isomers
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c) chain isomers
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d) none of these
Explanation
CH3CH2CH2OH and CH3CHOHCH3 Answer : (a)
Q.24
on Q354)
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a) CH3 - CH = CH2
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b) (C2H5)2 - OH
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c) CH3 - CH2 - CH2 - OH
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d)
Explanation
Answer : (d)
Q.25
on Q355) The end product of the following sequence is ..... ...
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a) CH3CH2OH
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b) CH3COCH4
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c) CH4
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d) CH3CHO
Explanation
Products: A) CH3CN B) CH3COOH C) CH3CH2OH Answer : (a)
Q.26
Which of the following statements is/are not correct?
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a) All alcohols are soluble in water
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b) Only the lower alcohols are soluble in water
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c) All alcohols are poisonous
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d) Methanol is poisonous
Explanation
Answer : ( a, c )
Q.27
Fermentation is ... .....
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a) endothermic
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b) reversible
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c) exothermic
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d) none of these
Explanation
Answer : (c)
Q.28
on Q358) Identify Z in the following series ..... ....
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a)
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b) CH3 - C ≡ CH
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c)
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d)
Explanation
X: CH3CH = CH2; Y: CH3CHBrCH2Br; Z: is alkyne Answer : (b)
Q.29
Consider the following compounds the most acidic nature?
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a)
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b)
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c)
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d)
Explanation
phenols are acidic, alcohols and Napthalene are neutral Answer : (a)
Q.30
Assertion: Ethanol is more viscous than glycerol Reason: Both possess H-bonding
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (d)
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