Arrange the following molecules from most to least polar.

CH4              CF2Cl2             CF2H2            CCl4                CCl2H2
I                         II                     III                   IV                        V

(1) III>V>II > IV=I                                 

(2) II>IV>III>IV>I

(3) III>II>V>IV>I                                 

(4) V>III>II>IV=I    

Subtopic:  Polarity |
 54%
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Which of the following statements is correct?

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

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

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

(4) All of these

Subtopic:  Resonance & Nature of Compounds |
 75%
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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

(1) (i) < (ii) < (iv) < (iii)                                                     

(2) (ii) < (i) < (iv) < (iii)

(3) (i) < (ii) < (iii) < (iv)                                                     

(4) (ii) < (i) < (iii) < (iv)

Subtopic:  van der Waal Force & Hydrogen Bonding |
 75%
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The boiling point of CCl4 is higher than that of CHCl3 because :

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

(2) CCl4 forms hydrogen bonds.

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

(4) CCl4 is more ionic than CHCl3

Subtopic:  van der Waal Force & Hydrogen Bonding |
 68%
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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
Subtopic:  Types of Chemical Bond |
 74%
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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
Subtopic:  Hybridisation |
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Assertion : F bond angle P = bond angle Q but not precisely 90°.

Reason : The molecule is slight bent T-shaped and there is repulsion between lone pairs of electrons.

  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
Subtopic:  Types of Chemical Bond | Polarity |
 81%
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Assertion : N2F3+ is planar at each nitrogen atom.

Reason : N3H, the bond angle HNN is 120° and both the NH bond lengths are not equal.

  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
Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
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Assertion : Carbon has unique ability to form - multiple bonds with itself and with other

                  atoms of small size and high electronegativity.

Reason : Heavier elements of group 14th do not form - multiple bonds with itself because

               their atomic orbitals are too large and diffuse to have effective overlapping.

  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
Subtopic:  Types of Chemical Bond |
 52%
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Assertion : NO+ and CN- both have same bond order and magnetism

Reason : NO+ and CN- are isoelectornic species.

  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
Subtopic:  M.O.T |
 78%
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