Q58 of 66 Page 154

In the following questions a statement of Assertion (A) followed by a statement of

Reason (R) is given. Choose the correct option out of the choices given below each question.


Assertion (A): All the carbon atoms in H2C = C = CH2 are sp2 hybridised


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


(i) Both A and R are correct and R is the correct explanation of A.


(ii) Both A and R are correct but R is not the correct explanation of A.


(iii) Both A and R are not correct.


(iv) A is not correct but R is correct.


In H2C = C = CH2 , both the terminal carbon atoms are sp2 hybridised, whereas the carbon atom present in the centre of the molecule is forming only two sigma bonds, as the sigma bond is used for calculating the hybridisation. Hence the hybridisation of the central carbon is sp.

So, the assertion is wrong.


Now, considering the Reason, In this molecule all the carbon atoms are attached to each other by double bonds, is true. Hence option (iv) is correct.


More from this chapter

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56

In the following questions a statement of Assertion (A) followed by a statement of

Reason (R) is given. Choose the correct option out of the choices given below each question.


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.


(i) Both A and R are correct and R is the correct explanation of A.


(ii) Both A and R are correct but R is not the correct explanation of A.


(iii) Both A and R are not correct.


(iv) A is not correct but R is correct.


 57

In the following questions a statement of Assertion (A) followed by a statement of

Reason (R) is given. Choose the correct option out of the choices given below each question.


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.


(i) Both A and R are correct and R is the correct explanation of A.


(ii) Both A and R are correct but R is not the correct explanation of A.


(iii) Both A and R are not correct.


(iv)A is not correct but R is correct.


 59

In the following questions a statement of Assertion (A) followed by a statement of

Reason (R) is given. Choose the correct option out of the choices given below each question.


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.


(i) Both A and R are correct and R is the correct explanation of A.


(ii) Both A and R are correct but R is not the correct explanation of A.


(iii) Both A and R are not correct.


(iv) A is not correct but R is correct.


 60

In the following questions a statement of Assertion (A) followed by a statement of

Reason (R) is given. Choose the correct option out of the choices given below each question.


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.


(i) Both A and R are correct and R is the correct explanation of A.


(ii) Both A and R are correct but R is not the correct explanation of A.


(iii) Both A and R are not correct.


(iv)A is not correct but R is correct.