Ncert Solutions Chemistry Class 11th

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Payal Gupta

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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.

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Payal Gupta

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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 strength decreases.

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Payal Gupta

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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.

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Payal Gupta

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(i) The reaction follows Markovnikov's rule leading to giving 2o carbocation as an intermediate.

 

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alok kumar singh

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 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: It was developed on the basis of Heisenberg's uncertainty principle and dual behaviour of matter.

Main features of this model are given below:

(i) The energy of electrons in an atom is quantized i.e. can only have certain values.

(ii) The existence of quantized electronic energy levels is a direct result of the wave like properties of electro

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alok kumar singh

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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.

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Payal Gupta

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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.

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alok kumar singh

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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 shortest wavelength, is deviated the most.

The spectrum of white light, that we can see, ranges from violet at 7.50 * 1014 Hz to red at

4*1014 Hz. Such a spectrum is called a continuous spectrum (Continuous because violet merges into blue, blue into green and so on). A similar spectrum is produced when a rainbow forms in the sky.

The emission spectra

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alok kumar singh

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An ideal body, which emits and absorbs radiations of all frequencies uniformly, is called a black body and the radiation emitted by such a body is called black body radiation. In practice, no such body exists. Carbon black approximates fairly closely to black body. A good physical approximation to a black body is a cavity with a tiny hole, which has no other opening. Any ray entering the hole will be reflected by the cavity walls and will be eventually absorbed by the walls.

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