Ncert Solutions Chemistry Class 11th
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Which of the following reactions of methane is incomplete combustion:
(i) 2CH4 + O2 
2CH3OH
(ii) CH4 + O2
HCHO + H2O
(iii) CH4 + O2 → C (s) + 2H2O (l)
(iv) CH4 + O2 → CO2 (g) + 2H2O (l)
Which of the following reactions of methane is incomplete combustion:
(i) 2CH4 + O2 2CH3OH
(ii) CH4 + O2 HCHO + H2O
(iii) CH4 + O2 → C (s) + 2H2O (l)
(iv) CH4 + O2 → CO2 (g) + 2H2O (l)
This is a multiple choice answer as classified in NCERT Exemplar
(iii) As the unburn carbon left out in this reaction thus it is an incomplete reaction
Upvote 
Arrange the following alkyl halides in decreasing order of the rate of β– elimination reaction with alcoholic KOH.
(B) CH3—CH2—Br
(C) CH3—CH2—CH2—Br
(i) A > B > C
(ii) C > B > A
(iii) B > C > A
(iv) A> C > B
Arrange the following alkyl halides in decreasing order of the rate of β– elimination reaction with alcoholic KOH.
(B) CH3—CH2—Br
(C) CH3—CH2—CH2—Br
(i) A > B > C
(ii) C > B > A
(iii) B > C > A
(iv) A> C > B
This is a multiple choice answer as classified in NCERT Exemplar
(iv) The order of reactivity of β– elimination reaction is 3o>2o>1o
Upvote Arrange the following carbanions in order of their decreasing stability.
(A) H3C - C ≡ C -(B) H - C ≡ C - (C) H3C - CH2
(i) A > B > C
(ii) B > A > C
(iii) C > B > A
(iv) C > A > B
Arrange the following carbanions in order of their decreasing stability.
(A) H3C - C ≡ C -(B) H - C ≡ C - (C) H3C - CH2
(i) A > B > C
(ii) B > A > C
(iii) C > B > A
(iv) C > A > B
This is a multiple choice answer as classified in NCERT Exemplar
(ii) The electronegativity of sp hybridization is higher than that of sp3 hybridization.
The +I effect destabilizes the carbanion.
Upvote Arrange the following hydrogen halides in order of their decreasing reactivity with propene.
(i) HCl>HBr> HI
(ii) HBr> HI >HCl
(iii) HI >HBr>HCl
(iv) HCl> HI >HBr
Arrange the following hydrogen halides in order of their decreasing reactivity with propene.
(i) HCl>HBr> HI
(ii) HBr> HI >HCl
(iii) HI >HBr>HCl
(iv) HCl> HI >HBr
This is a multiple choice answer as classified in NCERT Exemplar
(iii) The addition of alkyl halides to propene depends upon the H-X bond strength i.e. lesser the bond strength higher will be the reactivity of the alkyl halide. As down the group size of the halogens increases thus the bond stre
Upvote Which of the following will not show geometrical isomerism?
Which of the following will not show geometrical isomerism?
This is a multiple choice answer as classified in NCERT Exemplar
(iv) The two substituents attached to the same C atom of the C=C bond should be different to exhibit geometrical isomerisms.
Upvote The addition of HBr to 1-butene gives a mixture of products A, B and C
The mixture consists of
(i) A and B as major and C as minor products
(ii) B as major, A and C as minor products
(iii) B as minor, A and C as major products
(iv) A and B as minor and C as major products
The addition of HBr to 1-butene gives a mixture of products A, B and C
The mixture consists of
(i) A and B as major and C as minor products
(ii) B as major, A and C as minor products
(iii) B as minor, A and C as major products
(iv) A and B as minor and C as major products
This is a multiple choice answer as classified in NCERT Exemplar
(i) The reaction follows Markovnikov's rule leading to giving 2o carbocation as an intermediate.
Upvote What were the weaknesses or limitations of Bohr’s model of atoms? Briefly describe the quantum mechanical model of atom.
What were the weaknesses or limitations of Bohr’s model of atoms? Briefly describe the quantum mechanical model of atom.
Limitations of Bohr’s model of an atom:
(i) It could not explain spectrum of multi-electron atoms.
(ii) It could not explain Zeeman and Stark effects.
(iii) It could not explain shape of molecules.
(iv) It was not in accordance with Heisenberg’s uncertainty principle.
Quantum Mechanical Model:
Upvote Discuss the similarities and differences between a 1s and a 2s orbital.
Discuss the similarities and differences between a 1s and a 2s orbital.
Similarities:
(i) Both have spherical shape.
(ii) Both have same angular momentum.
Differences:
(i) 1s has no node while 2s has one node.
Energy of 2s is greater than that of 1s.
Upvote The correct IUPAC name of the following alkane is
(i) 3, 6 – Diethyl – 2 – methyl octane
(ii) 5 – Isopropyl – 3 – ethyl octane
(iii) 3 – Ethyl – 5 – isopropyl octane
(iv) 3 – Isopropyl – 6 – ethyl octane
The correct IUPAC name of the following alkane is
(i) 3, 6 – Diethyl – 2 – methyl octane
(ii) 5 – Isopropyl – 3 – ethyl octane
(iii) 3 – Ethyl – 5 – isopropyl octane
(iv) 3 – Isopropyl – 6 – ethyl octane
This is a multiple choice answer as classified in NCERT Exemplar
(i) 3, 6 – Diethyl – 2 – methyl octane
Octane is the longest chain here and the side chain follows the lowest sum rule.
Upvote Differentiate between continuous spectra and atomic spectra.
Differentiate between continuous spectra and atomic spectra.
Since ordinary white light consists of waves with all the wavelengths in the visible range, a ray of white light is spread out into a series of coloured bands called spectrum. The light of red colour which has the longest wavelength is deviated the least while the violet light, which has the shortes
Upvote