Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Chemistry Class 12

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Q.1. The increasing order of pKb for the following compounds will be    (2020)
(I) NH2 - CH = NH
(II) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(III) CH3 - NH - CH3
(1) (II) < (III) < (I)
(2) (I) < (II) < (III)
(3) (III) < (I) < (II)
(4) (II) < (I) < (III)
Ans.
(4)
Since, compound (B) is the derivative of guanidine, thus, it has lowest pKb value. In compound (A), the amine is sp2 hybridized, which is more basic than sp3 hybridized amine. Hence, the correct increasing order of pKb value is: (II) < (I) < (III).

Q.2. Consider the following reaction:
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
The product ‘X' is used     (2020)
(1) In protein estimation as an alternative to ninhydrin
(2) In acid base titration as an indicator
(3) As food grade colorant
(4) In laboratory test for phenols
Ans.
(2)
The reaction involved is
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Thus, the product formed is methyl orange, which is used as an indicator in acid-base titration.

Q.3. In the following reaction sequence,
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
the major product B is    (2020)
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(1)
The reaction involved is
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.4. The major product Z obtained in the following reaction scheme is    (2020)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Ans. (2)
The reaction involved is
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.5. Consider the following reactions,
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
The compound [P] is    (2020)
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Since, compound, P give color solid on diazotization followed by α-naphthol, so the compound P is -o/-m/-p-toluidine. From the second reaction, a tribromo product is obtained on reaction with bromine water, hence, the compound P must be m-toluidine. The reaction involved is
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.6. The decreasing order of basicity of the following amines is    (2020)
(I) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(II) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(III) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(IV) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) (I) > (III) > (IV) > (II)
(2) (III) > (I) > (II) > (IV)
(3) (II) > (III) > (IV) > (I)
(4) (III) > (II) > (I) > (IV)
Ans.
(4)
The basicity of the amines depends upon the availability of the lone pairs of electrons of nitrogen atom in the amines.
(I) The lone pairs of electrons of nitrogen in aniline is delocalized in the benzene ring, thus, they are very less available for protonation.
(II) In pyridine, the nitrogen atom is sp2 hybridized, thus, it is more basic than aniline.
(III) In cyclohexylamine, the lone pairs of electrons as very much available for protonation, thus, it is most basic among the given amines.
(IV) In pyrrole, the lone pair of electrons involved in ring to increasing the stability of pyrrole by making it aromatic, thus the lone pairs of electrons of nitrogen are not available for protonation.
Hence, the correct decreasing order of basicity the following amines is: (III) > (II) > (I) > (IV).

Q.7. Arrange the following amines in the decreasing order of basicity:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) I > II > III
(2) III > I > II
(3) III > II > I
(4) I > III > II
Ans.
(2)
Compound, Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev is most basic as the lone pair of nitrogen is easily available for the donation.
In case of compound Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRevlone pair is not in-volved in resonance but nitrogen atom is sp2 hybrid-sed whereas in compound II the lone pair of nitrogen is involved in aromaticity which makes it least basic.

Q.8. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Reaction involved for the given reaction:
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.9. The increasing basicity order of the following compounds is:    (2019)
(A) CH3CH2NH2
(B) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(C) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(D) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) (D) < (C) < (B) < (A)
(2) (D) < (C) < (A) < (B)
(3) (A) < (B) < (C) < (D)
(4) (A) < (B) < (D) < (C)
Ans.
(2)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
So, order of basic strength is:
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(B) > (A) > (C) > (D)

Q.10. The major product formed in the reaction given below will be:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(Bonus)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.11. An aromatic compound ‘A’ having molecular formula C7H6O2 on treating with aqueous ammonia and heating forms compound ‘B'. The compound ‘B’ on reaction with molecular bromine and potassium hydroxide provides compound ‘C’ having molecular formula C6H7N. The structure of ‘A’ is:    (2019)
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(1)
Reaction involved:
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.12. What will be the major product in the following mononitration reaction?    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(4)
In the given nitration reaction, major product will be formed as per the activating group, -NH part of Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev is activating while, Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev part is deactivating group.
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.13. The polymer obtained from the following reactions is    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.14. A compound ‘X’ on treatment with Br2/NaOH, provided C3H9N, which gives positive carbylamine test. Compound ‘X’ is:    (2019)
(1) CH3COCH2NACH3
(2) CH3CH2COCH2CH2
(3) CH3CH2CH2CONH2
(4) CH3CON(CH3)2
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
 Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.15. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans. 
(1)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev 
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.16. In the following compounds, the decreasing order of basic strength will be:    (2019)
(1) C2H5NH2 > NH3 > (C2H5)2NH
(2) (C2H5)2NH > NH3 > C2H5NH2
(3) (C2H5)2NH > C2H5NH2 > NH3
(4) NH3 > C2H5NH2 > (C2H5)2NH
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.17. Which of the following amines can be prepared by Gabriel phthalimide reaction?    (2019)
(1) n-butylamine
(2) triethylamine
(3) t-butylamine
(4) neo-pentylamine
Ans.
(1)
Primary amines are prepared by Gabriel phthalimide synthesis
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.18. Coupling of benzene diazonium chloride with 1 -naphthol in alkaline medium will give:    (2019)
(1) 

Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2)

 Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) 

Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) 

Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.19. The major product in the following reaction is:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2)Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans. 
(4)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.20. The major product obtained in the following reaction is:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(4)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.21. Aniline dissolved in dilute HCl is reacted with sodium nitrate at 0°C. This solution was added drop wise to a solution containing equimolar mixture of aniline and phenol in dil. HCl. The structure of the major product is:    (2019)
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
In acidic medium aniline is more reactive than phenol that’s why electrophilic aromatic substitution of Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev takes place with aniline.
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.22. Hinsberg’s reagent is:    (2019)
(1) C6H5COCI
(2) SOCl2
(3) C6H5SO2Cl
(4) (COCl)2
Ans.
(3)
Hinsberg’s reagent is benzenesulphonyl chloride. It is used for detection of primary, secondary and tertiary amines.

Q.23. The major products A and B for the following reactions are, respectively:    (2019)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.24. Ethylamine (C2H5NH2) can be obtained from N-ethylphthalimide on treatment with:    (2019)
(1) NH2NH2 
(2) CaH2 
(3) NaBH
(4) H2O
Ans.
(1)
reagent is NH2 - NH2 byproduct will be
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.25. Which of the following is NOT a correct method of the preparation of benzylamine from cyanobenzene?    (2019)
(1) H2/Ni
(2) (i) LiAlH4
(ii) H3O+
(3) (i) SnCl2 + HCl(gas)
(ii) NaBH4
(4) (i) HCl/H2O
(ii) NaBH4
Ans.
(4)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.26. Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives:    (2019)
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev 

Q.27. The increasing order of basicity of the following compounds is:    (2018)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) (a) < (b) < (c) < (d) 
(2) (b) < (a) < (c) < (d) 
(3) (d) < (b) < (a) < (c) 
(4) (b) < (a) < (d) < (c)  
Ans.
(4)
Order of base nature depends on electron donation tendency.
In compound (b) nitrogen is sp2 hybridized so least basic among all given compound
Compound (c) is a very strong nitrogeneous organic base as a lone pair of one nitrogen is delocalized in resonance and make another nitrogen negatively charged and conjugate acid have two equivalent resonating structure.
Thus it is most basic in given compound.
(d) is secondary amine more than (a) which is a primary amine.

Q.28. The increasing order of nitration of the following compounds is:    (2018)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) (a) < (b) < (d) < (c) 
(2) (a) < (b) < (c) < (d)
(3) (b) < (a) < (c) < (d)
(4) (b) < (a) < (d) < (c)
Ans.
(3)
Nitration is electrophilic aromatic substitution reaction. Methoxy and amino groups are strongly activating groups.  Methyl group is weakly activating group.
Since among methyl and methoxy group, methoxy group is more reactive than methyl group, (c) is more reactive than (d).
Even-though amino group is strongly activating group, it gets protonated in presence of acid to form anilinium ion which is strongly deactivating. Hence, (a) is less reactive than (c) and (d).
Note:
The activating groups increases the electron density on benzene ring and increases the rate of electrophilic aromatic substitution reaction. The deactivating groups decreases the electron density on benzene ring and decreases the rate of electrophilic aromatic substitution reaction.

Q.29. Products A and B formed in the following reactions are respectively:    (2018)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans. 
(1)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.30. Which of the following compounds will form significant amount of meta product during mono-nitration reaction?    (2017)
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
(a) Nitration reactions take place in presence of concentrated HNO3+ concentrated H2SO4.
(b) Aniline acts as a base. In presence of H2SO4, its protonation takes place and anilinium ion is formed
(c) Anilinium ion is a strongly deactivating group and meta directing in nature so it gives meta nitration product in a significant amount. 
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.31. The major product expected from the following reaction is:    (2017)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(2) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(3) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(4) Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.32. A mixture containing the following four compounds is extracted with 1 M HCl. The compound that goes to aqueous layer is:    (2017)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) IV
(2) II
(3) I
(4) III
Ans.
(2)
A mixture containing four compounds is extracted with 1M  HCl. The compound that goes to aqueous layer is compound (II) It is an amine. Pure amine is water insoluble. On reaction with HCl, it forms hydrochloride salt which is water soluble.
Hence, the option (2) is correct answer.

Q.33. Among the following compounds, the increasing order of their basic strength is:    (2017)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev
(1) (II) < (I) < (III) < (IV)
(2) (II) < (I) < (IV) < (III)
(3) (I) < (II) < (IV) < (III)
(4) (I) < (II) < (III) < (IV)
Ans.
(1)
Order of basicity
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.34. In the Hofmann bromamide degradation reaction, the number of moles of NaOH and Br2 used per mole of amine produced are:    (2016)
(1) One mole of NaOH and one mole of Br2. 
(2) Four moles of NaOH and two moles of Br2. 
(3) Two moles of NaOH and two moles of Br2. 
(4) Four moles of NaOH and one mole of Br2. 
Ans.
(4)
Previous year Questions (2016-20) - Compounds Containing Nitrogen Notes | EduRev

Q.35. The test to distinguish primary, secondary and tertiary amine is:    (2017)
(1) Mustard oil test
(2) C6H5SO2Cl
(3) Sandmeyer's reaction
(4) Carbylamine reaction
Ans.
(2)
Benzene sulphonyl chloride (C6H5SO2Cl) is used to distinguish primary, secondary and tertiary amine. 

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