What is the correct order from the weakest to the strongest carbon-oxygen bond for the following species? 

CO, CO2, CO32-, CH3OH

(A) CH3OH <CO32-<CO2<CO                         

(B) CO<CO2 <CO32-<CH3OH

(C) CH3OH <CO32-<CO<CO2                         

(D) CH3OH <CO2<CO32-<CO

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According to Molecular orbital theory which of the following statement is incorrect?

(A) LUMO level for C2molecule is σ2px orbital.      

(B) In C2 molecules both the bonds π are bonds.

(C) C2 is paramagnetic but C22-is diamagnetic.     

(D) In C22- ion there is one σ and two π bonds.

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Match the ionization processes listed in column – I with the changes observed as listed in
column-II. For this use the codes given below:

       Column- I                                                                 Column - II

(a) N2 N2+                                 (p) Bond order increases and magnetic property is changed.

(b) O2+O22+                               (q) Bond order decreases and magnetic property is changed.

(c) B2B2+                                   (r) Bond order increases and magnetic property is not changed.

(d) NO-NO                                  (s) Bond order decreases and magnetic property is changed.

Note : Here change in magnetic property refers to change from diamagnetic to paramagnetic
or paramagnetic to diamagnetic. 

                          a      b          c        d
(A)                     s       b          c       d
(B)                     s       p          r       q
(C)                     r       q          s       p
(D)                     p       s         q       r

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A diatomic molecule has a dipole moment of 1.2 D. If its bond length is equal to 10 -10 m then the fraction of an electronic charge on each atom will be:

1. 42%                                               

2. 52%

3. 37%                                               

4. 25%

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Arrange the following molecules from most to least polar.

CH4              CF2Cl2             CF2H2            CCl4                CCl2H2I                         II                     III                   IV                        V

(A) III>V>II > IV=I                                  (B) II>IV>III>IV>I

(C) III>II>V>IV>I                                  (D) V>III>II>IV=I    

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Which of the following statements is correct?

(A) CH33 COH is less acidic than CH33 SiOH.

(B) Like CO, its analogue of Si is not stable.

(C) In phosgene, C-O bond length is longer than expected while C-Cl bond length is shorter.

(D) All of these

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The increasing order of the strength of hydrogen bond in the following mentioned linkages
is

(i) O — H — S     (ii) O — H  — O    (iii) F – H – F   (iv) F – H – O

(A) (i) < (ii) < (iv) < (iii)                                                     

(B) (ii) < (i) < (iv) < (iii)

(C) (i) < (ii) < (iii) < (iv)                                                     

(D) (ii) < (i) < (iii) < (iv)

Concept Questions :-

Hydrogen Bonding
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The boiling pot of CCl4 is higher than that of CHCl3 because :

(A) The dipole moment of CCl4 is greater than that of CHCl3

(B) CCl4 forms hydrogen bonds.

(C) CCl4 has higher molecular mass than that of CHCl3

(D) CCl4 is more ionic than CHCl3

Concept Questions :-

Vanderwaal Force
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Assertion : Compounds of Hg2+ ions having an ionic radius of 116 pm are move covalent in character

                   than those of Ca2+ ions with almost identical size (114 pm) and the same charge.

Reason : For two ions of the same size and charge, one with an (n-1)d10ns0. electronic configuration

                 will be more polarizing than a cation with an (n-1)s2 (n-1)p6ns0, electronic configuration.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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Assertion : In tetrahedral hybridisation i.e., in sp3 hybridisation all p-orbitals are involved and no

                   p-orbital is left for coming with π-bonds.

Reason : Central atom can not form double bonds in the molecules or species having sp3hybridisation.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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