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

(A)

(B)

(C)

(D)

Concept Questions :-

Resonance
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(A) LUMO level for ${C}_{2}$molecule is ${\sigma }_{2px}$ orbital.

(B) In ${C}_{2}$ molecules both the bonds $\mathrm{\pi }$ are bonds.

(C) ${C}_{2}$ is paramagnetic but ${{C}_{2}}^{2-}$is diamagnetic.

(D) In ${{C}_{2}}^{2-}$ ion there is one $\sigma$ and two $\pi$ bonds.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(b) ${{O}_{2}}^{+}\to {{O}_{2}}^{2+}$                               (q) Bond order decreases and magnetic property is changed.

(c) ${B}_{2}\to {{B}_{2}}^{+}$                                   (r) Bond order increases and magnetic property is not changed.

(d) $N{O}^{-}\to NO$                                  (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

Concept Questions :-

M.O.T
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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%

Concept Questions :-

Polarity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Arrange the following molecules from most to least polar.

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

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

Concept Questions :-

Polarity
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which of the following statements is correct?

(A) ${\left(C{H}_{3}\right)}_{3}$ COH is less acidic than ${\left(C{H}_{3}\right)}_{3}$ 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

Concept Questions :-

Resonance
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The boiling pot of $CC{l}_{4}$ is higher than that of $CHC{l}_{3}$ because :

(A) The dipole moment of $CC{l}_{4}$ is greater than that of $CHC{l}_{3}$

(B) $CC{l}_{4}$ forms hydrogen bonds.

(C) $CC{l}_{4}$ has higher molecular mass than that of $CHC{l}_{3}$

(D) $CC{l}_{4}$ is more ionic than $CHC{l}_{3}$

Concept Questions :-

Vanderwaal Force
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Assertion : Compounds of ${\mathrm{Hg}}^{2+}$ ions having an ionic radius of 116 pm are move covalent in character

than those of ${\mathrm{Ca}}^{2+}$ 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)${\mathrm{d}}^{10}{\mathrm{ns}}^{0}.$ electronic configuration

will be more polarizing than a cation with an (n-1)${\mathrm{s}}^{2}$ (n-1)${\mathrm{p}}^{6}{\mathrm{ns}}^{0},$ 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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Assertion : In tetrahedral hybridisation i.e., in ${\mathrm{sp}}^{3}$ hybridisation all p-orbitals are involved and no

p-orbital is left for coming with $\mathrm{\pi }$-bonds.

Reason : Central atom can not form double bonds in the molecules or species having ${\mathrm{sp}}^{3}$hybridisation.

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