Ncert Solutions Chemistry Class 11th

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.

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.

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

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.

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.

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

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.

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.

Assertion: Classical mechanics fails when applied to microscopic objects like electrons, atoms, molecules etc.

Reason: Classical mechanics ignores the concept of dual behaviour of matter especially for sub-atomic particles and the uncertainty principle.

Assertion: Rainbow is a line spectrum.

Reason: In rainbow, the violet merges into blue, blue into green and so on.