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

What is the correct order of decreasing stability of the following cations.

Covalent bond can undergo fission in two different ways. The correct representation involving a heterolytic fission of CH₃ – Br is:

Write structures of various carbocations that can be obtained from 2-methylbutane. Arrange these carbocations in order of increasing stability.

Match the intermediates given in Column I with their probable structure in Column II.

Which of the following practices will not come under green chemistry?

An alkene ‘A’ contains three C – C, eight C – H σ bonds and one C – C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of ‘A’.

An alkene ‘A’ contains three C–C, eight C–H σ bonds and one C–C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write IUPAC name of ‘A’.

The following data are obtained when dinitrogen and dioxygen react together to form different compounds:-

(a) Which law of chemical combination is obeyed by the above experimental data?Give its statement.

(b) Fill in the blanks in the following conversions:

(i) 1 km = ______ mm = ______ pm

(ii) 1 mg = ______ kg = ______ ng

(iii) 1 mL = ______ L = _______ dm³

How do you express the bond strength in terms of bond order?

Compare the relative stability of the following species and indicate their magnetic properties;

`"O"_2, "O"_2^+, "O"_2^-`(superoxide), `"O"_2^(2-)`(peroxide)

Calculate the bond order of N₂, O₂, `"O"_2^+`and `"O"_2^-`?

Write IUPAC name of the product obtained by the ozonolysis of the following compound:

3,4-Dimethyl-hept-3-ene

Write IUPAC name of the product obtained by the ozonolysis of the following compound:

2-Ethylbut-1-ene 

Draw the cis and trans structures of hex-2-ene. Which isomer will have higher b.p. and why?

What effect does branching of an alkane chain has on its boiling point?

One of the reactions that takes place in producing steel from iron ore is the reduction of iron (II) oxide by carbon monoxide to give iron metal and CO₂.

\[\ce{FeO (s) + CO (g) ↔ Fe (s) + CO2 (g)}\]; K_p= 0.265 at 1050 K.

What are the equilibrium partial pressures of CO and CO₂ at 1050 K if the initial partial pressures are: p_CO = 1.4 atm and `"p"_("co"_2)`= 0.80 atm?

What are electrophiles and nucleophiles? Explain with examples.

Identify the reagents shown in bold in the following equation as nucleophiles or electrophiles:

\[\ce{C6H6 + \underline{\text{CH}_3\overset{+}{\ce{C}}{\ce{O}}} -> C6H5COCH3}\]

What is the relationship between the members of following pairs of structures? Are they structural or geometrical isomers or resonance contributors?

\[\begin{array}{cc}
\ce{D}\phantom{......}\ce{H}\\
\backslash\phantom{......}/\\
\ce{C = C}\\
\phantom{...}/\phantom{......}\backslash\phantom{...}\\\ce{H}\phantom{.......}\ce{D}
\end{array}\]

\[\begin{array}{cc}
\ce{D}\phantom{......}\ce{D}\\
\backslash\phantom{......}/\\
\ce{C = C}\\
\phantom{...}/\phantom{......}\backslash\phantom{...}\\\ce{H}\phantom{.......}\ce{H}\end{array}\]

The reaction: \[\ce{CH_3CH_2I + KOH_{(aq)} -> CH_3CH_2OH + KI}\] is classified as ______.