MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Chemistry MCQ
Alcohols, Phenols And Ethers Mcq Neet Chemistry
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give : ... [NEET 2020]
0%
a) Tert. butyl alcohol
0%
b) Isobutyl alcohol
0%
c) Isopropyl alcohol
0%
d) Sec. butyl alcohol
Explanation
Answer: (a)
Q.2
Anisole on cleavage with HI gives.... [NEET 2020]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
phenol is more soluble in NaOH and forms salts Answer: (c)
Q.3
tion Q3) The structure of intermediate A in the following reaction, is .... [NEET 2019]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.4
The compound that is most difficult to protonate is :
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer: (d)
Q.5
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order .... [ NEET 2018]
0%
a) C2H5Cl, C2H6, C2H5OH
0%
b) C2H5OH, C2H5Cl, C2H5ONa
0%
c) C2H5OH, C2H6, C2H5Cl
0%
d) C2H5OH, C2H5ONa, C2H5Cl
Explanation
Answer: (d)
Q.6
tion Q6) In the reaction the electrophile involved is .... .. [NEET 2018]
0%
a) dichloromethyl anion
0%
b) formyl cation
0%
c) dichloromethyl cation
0%
d) dichlorocarbene ( :CCl2)
Explanation
Answer: (d)
Q.7
Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively .... ...[NEET 2018]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(a)
Q.8
Which of the following is added to chloroform to slow down its aerial oxidation in presence of light? [ AFMC 2008]
0%
a) Carbonyl chloride
0%
b) Ethyl alcohol
0%
c) Sodium hydroxide
0%
d) Nitric acid
Explanation
Answer: (b)
Q.9
Which of the following has the maximum viscosity .. [ AFMC 2003]
0%
a) Glycol
0%
b) Ethanol
0%
c) Water
0%
d) Acetone
Explanation
Glycol has two hydrogen bonding, hence participation of hydrogen bonding is more Answer: (a)
Q.10
Glycerol on oxidation with bismuth nitrate produces. [ AFMC 1999]
0%
a) oxalic acid
0%
b) glyceric acid
0%
c) glyoxalic acid
0%
d) meso oxalic acid
Explanation
Answer: (d)
Q.11
The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on the alcohol is [ AFMC 2008]
0%
a) anhydrous AlCl3
0%
b) FeCl3
0%
c) anhydrous ZnCl2
0%
d) Cu
Explanation
In preparation of alkyl chloride by the action of dry HCl, the catalyst generally used is anhydrous ZnCl2 Answer:(c)
Q.12
Alkyl halides react with dialkyl copper reagents to give [ AIEEE 2005]
0%
a) alkenyl halides
0%
b) alkanes
0%
c) alkyl copper halides
0%
d) alkenes
Explanation
In corey House synthesis of alkanes alkyl halides reacts with lithium dialkyl cuprate R'X + LiR2Cu → R'-R + RCu + LiX Answer: (b)
Q.13
Elimination of bromine from 2-bromobutane results in the formation of [ AIEEE 2005]
0%
a) Predominantly 2-butyne
0%
b) Predominantly 1-butene
0%
c) Predominantly 2-butene
0%
d) equimolar mixture of 1 and 2-butene
Explanation
The formation of 2-butene is in accordance to Saytzeff's rule. The more substituted alkene is formed Answer: (c)
Q.14
ion Q12) Arrange following phenols in order of their increasing acidity { AFMC 2011]
0%
a) I > III > II
0%
b) I > II > III
0%
c) III > I > II
0%
d) III > II > II
Explanation
First and third , two structures are stabilized ay Inductive and resonance effect. In first structure release of proton is affected by formation of intramolecular hydrogen bonding between hydroxyl and nitro group. Thus Acidic strength of first structure is less compared to third. therefore structure III is more stable than structure I While second structure is stabilized by only inductive effect. Hence stability of II is least. Answer: (c)
Q.15
Chlorobenzene can be prepared by reacting aniline with [ IIT 1984]
0%
a) hydrochloric acid
0%
b) cuprous chloride
0%
c) chlorine in presence of anhydrous aluminium chloride
0%
d) nitrous acid followed by heating cuprous chloride
Explanation
C6H5NH2 → C6H5N2Cl → C6H6Cl For first reaction other reactants are HONO and HCl ( Nitrous acid) For second reaction catalyst is CuCl Answer: (d)
Q.16
The reaction of toluene with chlorine in presence of ferric chloride gives predominantly ..[ IIT 1986]
0%
a) benzoyl chloride
0%
b) m-chlorotoluene
0%
c) benzyl chloride
0%
d) o- and p- chlorotolunene
Explanation
The given reaction is an example of electrophilic substitution. Further CH3 group in toluene is o-,p -directing Answer: (d)
Q.17
The reaction conditions leading to the best yield of C2H5Cl are .. [IIT 1986]
0%
a) C2H6(excess) + Cl2 → ( in presence of uv light )
0%
b) C2H6 + Cl2 → ( at room temperature , dark)
0%
c) C2H6(excess) + Cl2( excess) → ( in presence of uv light
0%
d) C2H6 + Cl2(excess) → ( In presence of uv light)
Explanation
Chlorination beyond monochlorination during the preparation of alkyl halides in presence of UV light can be suppressed by taking alkane in excess Answer:(a)
Q.18
n-propyl bromide on treatment with ethanolic potassium hydroxide produces.. [ IIT 19987]
0%
a) Propane
0%
b) Propene
0%
c) Propyne
0%
d) Propanol
Explanation
CH3 - CH2 - CH2Br → CH3 - CH = CH2 In presence of ethanolic KOH and other product is HBr Answer: (b)
Q.19
The number of structural and configurational isomers of a bromo compound, C5 H9Br, formed by the addition of HBr to 2-pentyne respectively are [ IIT 1988]
0%
a) 1 and 2
0%
b) 2 and 4
0%
c) 4 and 2
0%
d) 2 and 1
Explanation
Addition of HBr to 2-pentyne gives two structural isomers I and II I) CH3C(Br) =CHCH2CH3 II) CH3CH= C(Br)CH2CH3 Each one of these will exist as a pair of geometrical isomers. Thus there are two structural and four configurational isomers Answer: (b)
Q.20
1-Chlorobutane on reaction with alcoholic potash gives [ IIT 19991]
0%
a) 1-butene
0%
b) 1-butanol
0%
c) 2-butene
0%
d) 2-butanol
Explanation
Product is CH3-CH2CH = CH2 ( elimination reaction) Note Alkyl halides gives alcohol with aq. KOH which is substitution reaction Answer: (a)
Q.21
The chief reaction product of reaction between n-butane and bromine at 130°C is ..[ IIT 1995]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
The reaction proceeds via free radical mechanism. As 2° free radicals are more stable than 1°, so CH3CH2-CH(Br)CH3 would be formed Answer:(b)
Q.22
Iso butyl magnesium bromide with dry ether and ethyl alcohol gives [ IIT 1995]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer: (b)
Q.23
During debromination of meso-2,3-dibromobutane, the major compound formed is .. [ IIT 1997]
0%
a) n -butane
0%
b) 1-butene
0%
c) cis-2-butene
0%
d) trans-2-butene
Explanation
Debromination is a trans-elimination reaction meso-2,3-Dibromobutane on debromination gives trans-2-butene Answer: (d)
Q.24
(CH3)3CMgCl on reaction with D2O produces ..[ IIT 1997]
0%
a) (CH3)3CD
0%
b) (CH3)3OD
0%
c) (CD3)3CD
0%
d) (CD3)3OD
Explanation
(CH3)3C-MgCl + D2O → (CH3)3C-D + Mg(OD)Cl Answer: (a)
Q.25
A solution of (+) -2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of SbCl5 due to the formation of [ IIT 1999]
0%
a) carbanion
0%
b) carbebe
0%
c) free-radical
0%
d) carbocation
Explanation
Occurrence of recemization points towards the formation of carbocation as intermediate, which being planner can be attacked from either side Answer:(d)
Q.26
ion Q23) Identify the set of reagent/ reaction conditions 'X' and 'Y' in the following set of transformations [ IIT 2002]
0%
a) X= dilute aqueous NaOH, 20°; Y = HBr/acetic acid 20°
0%
b) X = Concentrated alcoholic NaOH, 80° ; Y = HBr/acetic acid 20°
0%
c) X= dilute aqueous NaOH, 20°; Y = Br2/CHCl3, 0°
0%
d) X = Concentrated alcoholic NaOH, 80° ;Y = Br2/CHCl3, 0°
Explanation
Dehydrobromination by strong base (alc NaOH) followed by Markownioff addition Of HBr Answer: (b)
Q.27
ion Q25) How many structures for F are possible? [ IIT 2003]
0%
a) 2
0%
b) 5
0%
c) 6
0%
d) 3
Explanation
F can have three possible structures On bromination Butane-1 will give : 2 enantiomers cis-Buene-2 will give : 2 enatiomers trans-Butene-2 will give : one meso compound Answer: (d)
Q.28
What would be the product formed when 1-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether? [ IIT 2005]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
It is an example of intra molecular Wurtz reaction Br- is better leaving group than chloride. In this reaction alkali metal (Na) is electron donor Answer: (d)
Q.29
When phenyl magnesium bromide reacts with tert-butanol, the product would be ..[ IIT 2005]
0%
a) Benzene
0%
b) Phenol
0%
c) tert-butylbenzene
0%
d) tert-butyl phenyl ether
Explanation
Grignard reagents react with compounds containing active hydrogen to alkyl (or aryl) part of the Grignard reagent C6H5MgBr + Me3COH → Me3COMgBR Answer:(a)
Q.30
ion Q28) The reagent(s) for the following conversion ..[IIT 2007]
0%
a) alcoholic KOH
0%
b) alcoholic KOH followed by NaNH2
0%
c) aqueous KOH followed by NaNH2
0%
d) Zn/CH3OH
Explanation
Elimination of HBr from CH2=CHBr requires a stronger base because here, Br acquires partial double bond character due to resonance. Answer: (b)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page