Some Basic Principles and Techniques's Question 56 | Chemistry XI - Part 2 | NCERT Exemplar Questions

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MCQ (Single Correct Answer)

Assertion (A) Energy of resonance hybrid is equal to the average of energies of all canonical forms.

Reason (R) Resonance hybrid cannot be presented by a single structure.

Both A and R are correct and R is the correct explanation of A

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$

Both A and R are not correct

A is not correct but R is correct

MCQ (Single Correct Answer)

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.

Both A and R are correct and R is the correct explanation of A

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$

Both A and R are not correct

A is not correct but R is correct

MCQ (Single Correct Answer)

Assertion (A) All the carbon atoms in $\mathrm{H}_2 \mathrm{C}=\mathrm{C}=\mathrm{CH}_2$ are $s p^2$ - hybridised.

Reason (R) In this molecule all the carbon atoms are attached to each other by double bonds.

Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$

Both $A$ and $R$ are not correct

A is not correct but R is correct

MCQ (Single Correct Answer)

Assertion (A) Sulphur present in an organic compound can be estimated quantitatively by Carius method.

Reason (R) Sulphur is separated easily from other atoms in the molecule and gets precipitated as light yellow solid.

Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$

Both A and R are not correct

A is not correct but R is correct

MCQ (Single Correct Answer)

Assertion (A) Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.

Reason (R) The coloured components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.

Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$

Both A and R are not correct

$A$ is not correct but $R$ is correct

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