Chemistry

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This is a short answer type question as classified in NCERT Exemplar

Due to the +R effect halogens are ortho and para directing groups.

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New answer posted

a year ago

The quantum numbers of six electrons are given below. Arrange them in order of increasing energies. List if any of these combination(s) has/have the same energy
(i) n = 4, l = 2, m_l = -2, m_s = -1/2
(ii) n = 3, l = 2, m_l = 1, m_s = +1/2
(iii) n = 4, l = 1, m_l = 0, m_s = +1/2
(iv) n = 3, l = 2, m_l = -2, m_s = -111
(v) n = 3, l = l, m_l = -1, m_s = +1/2
(vi) n = 4, l = 1, m_l

...more

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Contributor-Level 10

The electrons may be assigned to the following orbitals :
(i) 4d
(ii) 3d
(iii) 4p
(iv) 3d
(v) 3p
(vi) 4p.
The increasing order of energy is :
(v) < (ii) = (iv) < (vi) = (iii) < (i)

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New answer posted

a year ago

If the position of the electron is measured within an accuracy of ± 0.002 nm, calculate the uncertainty in the momentum of the electron. Suppose the momentum of the electron is h/4π x 0.05 nm. Is there any problem in defining this value?

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

Contributor-Level 10

Since actual momentum is smaller than the uncertainty in measuring momentum, therefore, the momentum of electron cannot be defined

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a year ago

Arrange the following set of compounds in the order of their decreasing relative reactivity with an electrophile.Give reason

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Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

The electron donating group increases the reactivity in electrophilic substitution reaction whereas the electron withdrawing group decreases the reactivity in electrophilic substitution.

Thus, the order of reactivity

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New answer posted

a year ago

The velocity associated with a proton moving in a potential difference of 1000 V is 4.37 x 10⁵ m s^-1. If the hockey ball of mass 0.1 kg is moving with this velocity, calculate the wavelength associated with this velocity.

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Contributor-Level 10

ν = 4.37 x 10⁵ m s^-1, m = 0.1 kg

As per de Brogile's equation,

λ= m/v = (6.626 x 10^-34 kg m²s^-1) / (0.1 kg) x (4.37 x 10⁵ m s^-1)

=6.626/0.437 x 10^-34-5 m

= 1.516 x 10^-38 m

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New question posted

a year ago

Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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New answer posted

a year ago

How will you convert benzene into

(i) p – nitrobromobenzene

(ii) m – nitrobromobenzene

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Contributor-Level 10

This is a short answer type question as classified in NCERT Exemplar

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New answer posted

a year ago

If the velocity of the electron in Bohr's first orbit is 2.19 x 10⁶ m s^-1, calculate the de Brogile wavelength associated with it.

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Contributor-Level 10

ν = 2.19 x 10⁶ m s^-1

As per de Brogile's equation,

λ= m/v = (6.626 x 10^-34 kg m²s^-1) / (9.1 x 10^-31 kg) x (2.19 x 10⁶ m s^-1)

6.626/91 * 2.19= x 10^-34+25 m = 0.33243 x 10^-9 m = 332.43 pm

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New answer posted

a year ago

Similar to electron diffraction, neutron diffraction microscope is also used for the determination of the structure of molecules. If the wavelength used here is 800 pm, calculate the characteristic velocity associated with the neutron.

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Chemistry Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

Contributor-Level 10

λ = 800 pm = 800 x 10^-12 m

m = 1.675 x 10^-27 kg

As per de Brogile's equation,

ν =h/mλ = (6.626 x 10^-34 kg m²s^-1) / (1.675 x 10^-27 kg) x (800 x 10^-12 m)

=6.626/1.675 * 8 x 10^-34+27+10

= 0.494 x 10³ ms^-1

= 494 ms^-1

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New answer posted

a year ago

What will be the product obtained as a result of the following reaction and why?

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