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NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 3
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Q.1
During dehydration of alcohols to alkenes by heating with con.H2SO4 the initiation step is [ AIEEE 2003]
0%
a) formation of carbocation
0%
b) elimination of water
0%
c) formation of an ester
0%
d) protonation of alcohol molecule
Explanation
First step is formation of protonated alcohol Second step is formation of carbocation Third Elimination of proton to form ethene Answer: (d)
Q.2
Among the following compounds which can be dehydrated very easily is ..[ AIEEE 2004]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
3-methyl pentanol-3 will be hydrated most easily since it produces tertiary carbonium ion as intermediate Answer: (a)
Q.3
The best reagent to convert pent-3-en-2-ol into pent-3-in-2-one is [ AIEEE 2005]
0%
a) Pyridinium chloro-chromate
0%
b) Chromic anhydride in glacial acetic acid
0%
c) Acidic dichromate
0%
d) Acidic permanganate
Explanation
Pyridinium chloro-chromate (PCC) is specific for conversion Answer: (a)
Q.4
p-cresol reacts with chloroform in alkaline medium to give the compound A which adds hydrogen cyanide to form the compound B. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is[ AIEEE 2005]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(c)
Q.5
HBr reacts with CH2 = CH-OCH3 under anhydrous conditions at room temperature to give [ AIEEE 2006]
0%
a) BrCH2-CH2-OCH3
0%
b) CH3-CHBr-OCH3
0%
c) CH3CHO and CH3Br
0%
d) BrCH2CHO and CH3OH
Explanation
Methyl vinyl ether under anhydrous condition at room temperature undergoes addition reaction CH2=CH-OCH3 + HBr → CH3CHBr -OCH3 Answer: (b)
Q.6
The structure of the compound that gives a tribromo derivative on treatment with bromine water is [ AIEEE 2006]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
OH group activates the benzene ring and is orthro para directive correct option "c" Answer: (c)
Q.7
Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is [ AIEEE 2006]
0%
a) (CH3)2CHCH2OH
0%
b) PhCHOHCH3
0%
c) CH3CH2CH(OH)CH2CH3
0%
d) C6H5CH2CH2OH
Explanation
Only those alcohols which contain -CHOHCH3 group undergo haloform reaction. Among the given options only (b) contain this group, hence undergo haloform reaction Answer: (b)
Q.8
ion Q67) The electrophile involved in the reaction is[ AIEEE 2006]
0%
a) trichloromethyl anion (C-Cl3)
0%
b) formyl cation (C+HO)
0%
c) dichloromethyl cation (C+HCl2
0%
d) dichlrocarbene ( :CCl2)
Explanation
This is Riemer-Tiemann reaction and the electrophile is dichlorocarbene Answer:(d)
Q.9
ion Q68) In the following sequence of reactions. compound D is [ AIEEE 2007]
0%
a) propanal
0%
b) butanal
0%
c) n-butyl alcohol
0%
d) n-propyl alcohol
Explanation
Answer: (d)
Q.10
Phenol, which reacts with concentrated sulphuric acid and then with concentrated nitric acid, give [ AIEEE 2008]
0%
a) 2,4,6 - trinitrobenzene
0%
b) o-nitrophenol
0%
c) p-nitrophenol
0%
d) nitrobenzene
Explanation
Phenol on reaction with concentrated Sulphuric acid gives a mixture o- and p- products (i.e. -SO3H group, occupies o- and p- position) At room temperature o-product is more stable, which on treatment with concentrated Nitric acid will yield o-nitrophenol Answer: (c)
Q.11
The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is [ AIEEE 2009]
0%
a) salicylaldehyde
0%
b) salicylic acid
0%
c) phthalic acid
0%
d) benzonic acid
Explanation
Answer: (b)
Q.12
Glycerol contains [ AIIMS 1997]
0%
a) one primary and two secondary alcoholic group
0%
b) two primary and one secondary alcoholic group
0%
c) one primary, one secondary and one tertiary alcoholic groups
0%
d) one secondary and two tertiary alcoholic groups
Explanation
The structure of glycerol is It contains two primary and one secondary alcoholic groups Answer:(b)
Q.13
Chloroform and concentrated HNO3 react to produce [ AIIMS 1997]
0%
a) CHCl2NO2
0%
b) CHCL2HNO3
0%
c) CCl3NO2
0%
d) CCl3NO3
Explanation
Chloroform and Nitric acid react to produce CCl3NO2, which is also known as chlropicrin. Answer: (c)
Q.14
Which pair can be distinguished by using Tollen's reagent? [ AIIMS 1997]
0%
a) Ethanol and propanol
0%
b) Ethanoic acid and acetone
0%
c) Ethanoic acid and propanal
0%
d) Methanol and methanoic acid
Explanation
Ethanoic acid and propanal can be distinguished by Tollen's reagent as propanal responds To Tollen's reagent but Ethanoic acid don't Answer: (c)
Q.15
When two halogens are attached to same carbon atom, it is known as [ AIIMS 1999]
0%
a) vic-dihalide
0%
b) gem-dihalide
0%
c) α and ω - dihalide
0%
d) α, β- dihalide
Explanation
Answer: (b)
Q.16
ion Q75) The product obtained from the reaction is [ AIIMS 1998]
0%
a) Benzene
0%
b) Toluene
0%
c) Salicylic acid
0%
d) Benzoic acid
Explanation
Answer:(c)
Q.17
Prestone is a mixture of [ AIIMS 1998]
0%
a) Glycol + H2O
0%
b) Glycerol + H2O
0%
c) Acetone + H2O
0%
d) Propanal + H2O
Explanation
Prestone is a mixture of glycol + H2O. It has freezing point much below 0°C, hence it is used as an antifreeze for automobile radiators Answer: (a)
Q.18
0.5g of sample of bleaching powder was suspended in water and an excess KI added. On acidifying with dil. H2SO4, I2 was liberated which required 50 cc of N/10 hypo solution. The percentage of Cl2 in bleaching powder is [ AIIMS 1998]
0%
a) 35.5%
0%
b) 45.5%
0%
c) 25.5%
0%
d) 39.5%
Explanation
The concerned chemical reactions are CaOCl2 + 2CH3COOH → (CH3COOH)2Ca + H2O Cl2 2KI + Cl2 → 2KCl + I2 I2 + 2 Ma2S4O6 + 2NaI Thus molar equivalent of hypo = molar equivalent I2 =molar equivalent Cl2 molar equivalent of hypo ≡ 50 ×(1/10) = 5 we know that molecular equivalent of Cl2 = (Wt. of Cl2 ×1000 ) / ( Equ.Weight of Cl2) 5 = Wt. of Cl2 ×1000 ) / 35.5 Wt of Cl2 = (355×5) / 1000 = 0.1775g % of Cl2 = (0.1775×100) / 0.5 = 35.5% Answer: (a)
Q.19
Vinegar is represented by [ AIIMS 1999]
0%
a) CH3COOH
0%
b) CH3CH2COOH
0%
c) HCOOH
0%
d) CH3CH2CH2COOH
Explanation
Answer: (a)
Q.20
ion Q79)In reaction below Z is
0%
a) phenol
0%
b) benzoic acid
0%
c) salicylaldehyde
0%
d) carbolic acid
Explanation
Answer:(c)
Q.21
Gammexane is
0%
a) Chloral
0%
b) BHC
0%
c) DDT
0%
d) HCB
Explanation
Gammexane is commercial name of Benzene hexachloride . It is effective insecticide. Chemically it is C6H6Cl6 Answer: (b)
Q.22
Ethyl alcohol reacts with chlorine to produce [ AIIMS 2000]
0%
a) CH3CH2Cl
0%
b) CH2ClCH2OH
0%
c) CHCl2CH2CH2OH
0%
d) CCl3CHO
Explanation
Ethyl Alcohol reacts with chlorine to produce CCl3CHO Answer: (d)
Q.23
Picric acid is [ AIIMS 2000]
0%
a) Trinitrophenol
0%
b) Trinitrotoluene
0%
c) Trinitrobenzene
0%
d) Tribromobenzene
Explanation
Picric acid is sym-trinitrophenol Answer: (a)
Q.24
Lucas reagent is [ AIIMS 2000]
0%
a) anhy. AlCl3 + conc. HCl
0%
b) anhy. AlCl3 + conc. HNO3
0%
c) anhy. ZnCl2
0%
d) anhy. ZnCl2 + conc. HCl
Explanation
Lucas reagent is anhydrous ZnCl2 + HCl which is used to distinguish between primary, secondary, tertiary alcohols Answer:(d)
Q.25
Lucas test is used for the detection of [ AIIMS 2002]
0%
a) alcohols
0%
b) alkyl halides
0%
c) phenols
0%
d) aldehydes
Explanation
Answer: (a)
Q.26
The intermediate formed in aldol condensation is [ AIIMS 2002]
0%
a) aldol
0%
b) carbanion
0%
c) alcohol
0%
d) α-hydrogen ester
Explanation
Aldol condensation is carried out on aldehydes or ketones having α-hydrogen atom in presence of base which abstracts α-H atom from aldehyde/ ketone to form corresponding carbanion which is stabilised by resonance Answer: (b)
Q.27
Propan-1-ol can be prepared from propene by [ AIIMS 2003]
0%
a) H2O / H2SO4
0%
b) Hg(OAc)2/ H2O followed by NaBH4
0%
c) B2H6 followed by H2O2
0%
d) CH3CO2H / H2SO4
Explanation
Answer: (c)
Q.28
Among the following, the dissociation constant is highest for [ AIIMS 2004]
0%
a) C6H5OH
0%
b) C6H5CH2OH
0%
c) CH3C ≡ CH
0%
d) CH3NH3+ Cl-
Explanation
Dissociation constant will be highest for CH3NH3+ Cl- because it is ionic in nature Answer: (d)
Q.29
Among the following the one which reacts most readily with ethanol is [ AIIMS 2004]
0%
a) p-nitrobenzyl bromide
0%
b) p- chlorobenzyl bromide
0%
c) p- methoxybenzyl bromide
0%
d) p-methylbenzyl bromide
Explanation
p-nitrobenzyl bromide , because it gives carbonium ion most readily as NO2 stabilize the ring Answer: (a)
Q.30
The most suitable reagent for the conversion of RCH2OH → TCHO is [ AIIMS 2004]
0%
a) KMnO4
0%
b) K2CCr2O7
0%
c) CrO3
0%
d) PCC( pyridine chlorochromate
Explanation
PCC( pyridine chlorochromate) is most suitable. Other reagent will convert alcohol to acid Answer:(d)
0 h : 0 m : 1 s
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