Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions for Chemistry

Consider structures I to VII and answer the question:

Identify the pairs of compounds that represents chain isomerism.

Compounds with same molecular formula but differing in their structures are said to be structural isomers. What type of structural isomerism is shown by

CH₃ – S – CH₂ – CH₂ – CH₃

And 

\[\begin{array}{cc}
\phantom{.....................}\ce{CH3}\\
\phantom{................}/\\
\phantom{}\ce{CH3 - S - CH}\\
\phantom{...............}\backslash\\
\phantom{....................}\ce{CH3}
\end{array}\]

Why does SO₃ act as an electrophile?

Match the terms mentioned in Column I with the terms in Column II.

Assertion (A): Pent- 1- ene and pent- 2- ene are position isomers.

Reason (R): Position isomers differ in the position of functional group or a substituent.

The molecules having dipole moment are:

(i) 2,2-Dimethylpropane

(ii) trans-Pent-2-ene

(iii) cis-Hex-3-ene

(iv) 2, 2, 3, 3 - Tetramethylbutane.

Assertion (A): The compound cyclooctane has the following structural formula:

It is cyclic and has conjugated 8π-electron system but it is not an aromatic compound.

Reason (R): (4n + 2)π electrons rule does not hold good and ring is not planar.

How can you apply green chemistry for the following:

To avoid use of halogenated solvents in drycleaning and that of chlorine in bleaching.

For dry cleaning, in the place of tetrachloroethane, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethane? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution? Explain.

If 10 volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced?

What does atomic radius and ionic radius really mean to you?

What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-

F^-

What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-

Ar

What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-

Mg²⁺

What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-

Rb⁺

Consider the following species:-

N^3–, O^2–, F^–, Na⁺, Mg²⁺ and Al³⁺

Arrange them in the order of increasing ionic radii.

Consider the following species:-

N^3–, O^2–, F^–, Na⁺, Mg²⁺ and Al³⁺

What is common in them?

Explain why cations are smaller and anions larger in radii than their parent atoms?

The size of isoelectronic species — F^-, Ne and Na⁺ is affected by ______.

Explain the important aspects of resonance with reference to the `"CO"_3^(2-)` ion.