Home
Class 11
CHEMISTRY
The correct order of stabilities of the ...

The correct order of stabilities of the following resonance structures is :
(I) `H_2 C = overset (oplus) N = overset (Ө) N`
(II) `H_2 overset (oplus) C - N = overset (Ө) N`
(III) `H_2 overset (Ө) C - overset (oplus) N -= N`
(IV) `H_2 overset (Ө) C - N = overset (oplus) N`.

A

`(III) gt (I) gt (IV) gt (II)`

B

`(I) gt (III) gt (II) gt (IV)`

C

`(I) gt (II) gt (IV) gt (III)`

D

`(II) gt (I) gt (III) gt (IV)`

Text Solution

Verified by Experts

The correct Answer is:
B
Both (I) and (III) have more number of covalent bonds than `(II)` and `(IV)`. But (I) is the most stable as it has negative charge on more electronegative N atom while (III) has negative charge on less electronegative C atom. In both (I) and (III), the octet of every atom is complete. Thus, (III) is the second most stable.
Both (II) and (IV) have equal number of covalent bonds but (II) is more stable as it has negative charge on more electronegative N while (IV) has negative charge on less electronegative C atom. Note that in (II), the octet of C is incomplete while in (IV), the octet of N is incomplete. Thus, the correct stability order is
`IgtIIIgtIIgtIV`
Promotional Banner

Topper's Solved these Questions

  • CHEMICAL BONDING

    R SHARMA|Exercise Archives|73 Videos

  • CHEMICAL BONDING

    R SHARMA|Exercise Question Bank (Level-III)|19 Videos

  • AROMATIC HYDROCARBONS

    R SHARMA|Exercise Archives|59 Videos

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS

    R SHARMA|Exercise ARCHIVES|37 Videos

Similar Questions

Explore conceptually related problems

The correct stability order of the following resonance structures is (I)H_(2)C = overset(+)N = overset(-)N" "(II)H_(2)overset(+)C - N = overset(-)N (III)H_(2)overset(-)C - overset(+)N = N" "(IV)H_(2)overset(-)C - N = overset(+)N

Give the stability of the following resonance structures (a) H_(2)C = overset(o+)N =overset(Θ) (b) H_(2)overset(o+)C -N =overset(Θ)N (c ) H_(2)overset(Θ)C -overset(o+)N -= N (d) H_(2) overset(Θ)C - N = overset(o+)N .

The correct stability order of the following resonance structrue is : H_2 C = overset (+)(N) = overline(N) H_2 overset (+)C = (N) = overline(N) H_2overline( C) - overset (+) (N) -= N H_2overline( C) - overset (+) (N) -= N .

The correct stability order of the following resonance structures is : x H_(2)C=overset(o+)underset((I))N=overset(Ɵ)N H_(2)overset(o+)Cunderset((II))-N=overset(Ɵ)N H_(2)overset(Ɵ)C-underset((III))overset(o+)N-=N H_(2)overset(Ɵ)C-underset((IV))N=overset(o+)N

The increasing order of pK_b value of the following is : (I) HC -= C^(Ө) H^(Ө) overset (Ө) NH_2 (IV) C overset (Ө) H_3 .

The correct stability order of the following resonance structure is: {:(CH_(2)=C=O,H_(2)overset(-)(C)-overset(+)(C)=O,H_(2)O=overset(+)(C)-overset(-)(O) , H_(2)overset(-)(C)-C-=O),((I),(II),(III),"(IV)"):}