Class 11th

Which element does not have any neutron?

(a) Li (b) C (c) H (d) B

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Kindly go through the solution

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

Which element does not have any neutron?

(a) Li (b) C (c) H (d) B

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An alkane C₈H₁₈ is obtained as the only product on subjecting a primary alkyl halide to Wurtz reaction. On monobromination this alkane yields a single isomer of a tertiary bromide. Write the structure of alkane and the tertiary bromide.

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

The reaction is

The alkane is

The tertiary bromide is

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Which one of the following statements is correct?

(a) Fe³⁺ is more paramagnetic than Fe²⁺.

(b) Fe²⁺ is more paramagnetic than Fe³⁺.

(c) Both are equally paramagnetic.

(d) They are non-magnetic.

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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(a) As Fe³⁺ contains 5 impaired electrons while Fe²⁺ contains only 4 unpaired electrons. Fe³⁺ is more paramagnetic.

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Write hydrocarbon radicals that can be formed as intermediates during monochlorination of 2-methylpropane? Which of them is more stable? Give reasons

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

The 2-methylpropane would lead to two types of radicals.

Among the two 3^o radical is most stable as it contains 9 ∝ -hydrogen whereas 1^o radical contains only 1 ∝ -hydrogen.

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Assertion: Symmetrical distribution of electrons leads to stability.

Reason: Electronic distribution of an element is important to understand and explain the chemical behaviour of the element.

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(b) Both the statements are correct but R is not the reason for A.

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Assertion: Chromium and copper have five and ten electrons in 3d orbitals rather than four and nine as their position would have indicated with two-electrons in the 4s orbital.

Reason: Fully filled and half-filled orbital shave extra stability that is, lower energy.

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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(a) Fully filled and half-filled orbitals have extra stability (that is, lower energy). Thus, p³, p⁶, d⁵, d¹⁰, f ⁷, f¹⁴ etc. configurations, which are either half-filled or filled, are more stable. Chromium and copper therefore adopt the d⁵ and d¹⁰ configuration.

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Write the structures and names of products obtained in the reactions of sodium with a mixture of 1-iodo-2-methylpropane and 2-iodopropane.

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

It is a Wurtz reaction where alkane is formed.

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Assertion: Both the exact position and exact velocity of an electron in an atom cannot be determined simultaneously (Heisenberg uncertainty principle).

Reason: The path of an electron in an atom can be determined accurately.

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Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Thirteen

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(c) The path of an electron in an atom can never be determined or known accurately. That is why there is only a probability of finding the electron at different points in an atom.

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The relative reactivity of 1°, 2°, 3° hydrogen's towards chlorination is 1 : 3.8 : 5. Calculate the percentages of all monochlorinated products obtained from 2-methylbutane.

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