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NEET Chemistry MCQ
Compounds Containing Nitrogen Mcq Neet Chemistry
Quiz 2
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Q.1
Diazotisation can be carried out by the action of NaNO2 and dilute HCl at ice cold temperature on ... [ KCET 1992]
0%
a) aromatic secondary amine
0%
b) aromatic primary amine
0%
c) aromatic nitro compound
0%
d) aliphatic amine
Explanation
Only these aromatic primary amines undergo diazotisation in which -NH2 is attached to nucleus Answer : (b)
Q.2
The reaction of chloroform with alcoholic KOH and p-toludine forms
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer : (d)
Q.3
The reduction of which of the following compound would yield secondary amine? ...[ DEC 2004]
0%
a) Carbylamine
0%
b) Alkyl amne
0%
c) Secondary nitro compound
0%
d) Primary amine
Explanation
Answer : (a)
Q.4
A compound which on reaction with aqueous nitrous acid gives an oily nitrosoamine is [ CET Haryana) 1998]
0%
a) methylamine
0%
b) ethylamine
0%
c) diethylamine
0%
d) triethylamine
Explanation
Secondary amines react with HNO2 to give Oily nitrosoamine Answer : (c)
Q.5
Which of the following is the strongest base? [ AIEEE 2004]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
In option "d" compound, the non-bonding electron pair of nitrogen does not take part in resonance. In other three compounds, the non-bonding electron pair of nitrogen is delocalized into benzene ring by resonance, as a result the electron density on the N atom decreases, due to which basicity decreases Answer : (d)
Q.6
The reagent that reacts with nitromethane to form mehylhydroxylamine is
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a) Zn/HCl
0%
b) Sn/HCl
0%
c) Zn/NH4Cl
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d) Zn/NaOH
Explanation
Answer : (c)
Q.7
The compound that is most reactive towards electrophilic nitration is
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a) Benzene
0%
b) Nitrobenzene
0%
c) Toluene
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d) Benzoic acid
Explanation
Presence of an electron releasing group (+I effect) activates the benzene ring towards electrophilic nitration Answer : (c)
Q.8
The correct order of increasing basic nature of the bases NH3, CH3NH and (CH3)2NH is .... [ AIEEE 2003]
0%
a) CH3NH2 < NH3 < (CH3)2NH
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b) (CH3)2NH < NH3 < CH3NH2
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c) NH3 < CH3NH2 < (CH3)2NH
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d) CH3NH2 < (CH3)2NH < NH3
Explanation
Except the amines containing tertiary butyl group, all lower aliphatic amines are stronger bases than ammonia because of +I(iductive) effect. The alkyl groups, which are electron releasing groups, increases the electron density around the nitrogen thereby increasing the availability of the lone pair of electrons to proton or Lewis acids and making the amine more basic. the observed order in the case of lower members is found to be as secondary > primary > tertiary factor Crowding of alkyl groups cover nitrogen atom. Thus the relative strength is in oder (CH3)2NH > CH3NH2 > NH3 Answer : (c)
Q.9
An aromatic primary amine with cold nitrous acid leads to the formation of ... ...[ KCET 1993]
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a) alcohol
0%
b) nitrite
0%
c) dizonium salt
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d) benzene
Explanation
Answer : (c)
Q.10
Primary nitro compounds react with nitrous acid to form nitrolic acids which dissolve in NaOH giving
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a) Colourless solution
0%
b) Red solution
0%
c) Yellow solution
0%
d) Blue solution
Explanation
Answer : (b)
Q.11
How many primary amines are possible for the formula C4H11N? [ MLNR 1995]
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a) 1
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b) 2
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c) 3
0%
d) 4
Explanation
CH3CH2CH2CH2NH2 Answer : (d)
Q.12
Which of the following is not a nitro-derivative? [ DEC 2004]
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a) CH3CH2ON=O
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b) C6H4(OH)NO2
0%
c) C6H5NO2
0%
d)
Explanation
CH3CH2ON=O ia a nitrite derivative Answer : (a)
Q.13
Hydrolysis of CH3CH2NO2 with 85% H2SO4 gives
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a) CH3CH = NOH
0%
b) CH3COOH
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c) C2H6
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d) CH3CH2OH
Explanation
On hydrolysis of Nitroethane we get Acetic acid and Hydroxylamine (NH2OH) Answer : (b)
Q.14
Amongst the compounds given, the one that would form a brilliant colured dye on treatment with NaNO2 in dil HCl followed by addition to an alakline solution of β-naphthol is [ HT 2011]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
It is a test for -NH2 group attached on benzene nucleus following diazotisation and coupling reaction Answer : (c)
Q.15
A compound A when treated with HNO3 ( in presence of H2SO4) gives compound B, which is then reduced with Sn and HCl to aniline? The compound is
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a) Acetamide
0%
b) Benzene
0%
c) Ethane
0%
d) Toluene
Explanation
Answer : (b)
Q.16
Assertion: Amine are more basic than esters and ethers Reason: The intermediate carbanion is stabilized due to the presence of nitro group
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a) both the assertion and reason are true and reason explains the assertion
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b) both the assertion and reason are true but reason does not explain the 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 : (b)
Q.17
Which of the following statements is not correct regarding aniline?
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a) It is soluble in water
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b) It reacts with sodium to give hydrogen
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c) It can be steam-distilled
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d) It is less basic than ethyl amine
Explanation
Aromatic amines are insoluble in water Answer : (a)
Q.18
ion Q46) X in the following equation is
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a) Na2S
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b) Sn/HCl
0%
c) LiAlH4
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d) All of these
Explanation
Na2S causes selective reduction of one -NO2 group out of the two Answer : (a)
Q.19
than one correct answers Q47) Which of the following statements is/are correct?
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a) In the case of primary, secondary and tertiary amines, the basic strength depends on the extent of hydrogen bonding in the protonated amines
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b) The presence of groups like -OCH3 anad -CH3 increases the basic strenth of amines
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c) The presence of groups like -NO2, -CN and halogens decreases the basic strength of amine
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d) The basic strength of amines depends on their concentration
Explanation
Answer : (a,b,c)
Q.20
ion Q48) The correct order of basicities of the following compounds is .... [ IIT 2001]
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a) 2 > 1 > 3 > 4
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b) 1 > 3 > 2 > 4
0%
c) 3 > 1 > 2 > 4
0%
d) 1 > 2 > 3 > 4
Explanation
Negative charge developed on N in the resonance hybrid makes it more basic as it loses electron pir readily. Also 2° amine is more basic than 1° amine due to +ve IE of alkyl group. In amide, the lone pair remains less available due to delocalisation in resonance Answer : (b)
Q.21
Among the following, the weakest base is
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a) C6H5CH2NHCH3
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b) CH3NHCHO
0%
c) C6H5CH2NH2
0%
d) O2NCH2NH2
Explanation
A strong electron withdrawing group -CHO directly attached to amino group withdraws its electron towards resonance Answer : (b)
Q.22
Aniline reacts with acetyl chloride gives
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a) Benzene
0%
b) Acetamide
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c) Phenol
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d) Acetanilide
Explanation
Answer : (d)
Q.23
Reaction of nitrous acid with alophatic primary amine in the cold gives
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a) A dye
0%
b) Anitrite
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c) A dizonium salt
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d) An alcohol
Explanation
Answer : (d)
Q.24
Diazonium salt id formed when nitrous acid is treated with ... [ DEC 2005]
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a) Primary aliphatic amine
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b) Secondary aliphatic amine
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c) Primary aromatic amine
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d) Secondary aromatic amine
Explanation
Primary aromatic amines reacts with nitrous acid at 273-278K (0 - 5 °C) to form arene-diazonium salts NaNO2 + HCl → HNO2 + NaCl Answer : (c)
Q.25
Which of the following is least basic
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a)
0%
b)
0%
c)
0%
d)
Explanation
- NO2 is strong electron withdrowing group hence decreases the basic strength to maximum extent Answer : (c)
Q.26
tha one correct answers Q54) Urea is
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a) aliphatic amine
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b) nitrogenous organic compound
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c) acid amine
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d) aromatic amine
Explanation
Answer : (b,c)
Q.27
Which one of the following is a typical example of zwitter ion?
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a) Aminophenol
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b) Acetamide
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c) Aniline
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d) Glycine
Explanation
Answer : (d)
Q.28
ionMore than one correct answers Q56) Which is/are correct statement
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a) I is more basic than II
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b) II is more basic than I and III
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c) III is more basic than II
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d) All are atomatic bases
Explanation
Answer : (b.d)
Q.29
For carbylamine reaction, we need hot alcoholic KOH and
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a) A secondary amine and trichloromethane
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b) Any primary amine and chloroform
0%
c) Chloroform and silver powder
0%
d) A primary amine and an alkyl halid
Explanation
Carbylamine reaction is a characteristic reaction of primary amines with chloroform and hot alcohol KOH Answer : (b)
Q.30
Acetamide is treated separately with the following reagents. Which one of these would give methyl amine?
0%
a) Hot conc. H2SO4
0%
b) Sodalime
0%
c) NaOH + Br2
0%
d) PCl5
Explanation
Answer : (c)
0 h : 0 m : 1 s
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