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The hydrogen bond is strongest in...

The hydrogen bond is strongest in

A

`O-H - - - - S`

B

`N- H - - - - -N`

C

`F-H - - - - -F`

D

Both (1) & (2)

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The correct Answer is:
C
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It is a common observation that many compounds containing hydrogen attached to highly electronegative elements such as oxygen, nitrogen, or fluorine, often exhibit unexpected properties, such as relatively high melting points, boiling points, viscosity, solubility in water etc Such an unexpected behaviour can be explained on the basis of hydrogen bonding. When a hydrogen atom is attached to a highly electronegative element of small size such as F. N, 0. etc. the electronegative atoms strongly attracts the shared pair of electrons towards it self. As a result, the hydrogen atom becomes slightly positive and the electronegative element becomes slightly negative when two molecules of such a substance say HF come close to each other, the negatively charged fluorine atom of one molecule attracts the positively charged hydrogen atom of the other molecule. A hydrogen atom, thus links to highly electronegative atoms, one by a strong covalent bond and the other by weak electrostatic attraction as shown ahead overset(delta+)H-overset(delta-)F....overset(delta+)H-overset(delta-)F , the dotted line represents a hydrogen bond. Hydrogen bond is strongest in

AAKASH INSTITUTE-CHEMICAL BONDING AND MOLECULAR STRUCTURE -Assignment Section -A Objective Type Questions (One option is correct)
  1. The bond between carbon atom (1) and carbon atom (2) in the compound N...

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  2. Number of sigma bonds , pi bonds and lone pair on Xe form of XeOF(4)

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  3. The hydrogen bond is strongest in

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  4. How many sigma bonds and pi bonds are present in a benzene molecules ?...

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  5. Atomic orbitals involved in hybridisation of SF(6) molecule

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  6. The hybridisation of 'S' in SO(2) is

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  7. The compound in which the distance between the two adjacent carbon ato...

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  8. Which of the following compound of group-14 elements would you expect ...

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  9. The order rule is not valid for the molecule

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  10. The compound which contains both ionic and covalent bonds is

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  11. The ion that is isoelectronic with CO is

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  12. The type of bonds present in NH(4)Cl are

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  13. One hybridization of one s and one p orbital we get

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  14. If molecule MX3 has zero dipole moment, the sigma bonding orbitals use...

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  15. The species in which the cantral atom uses sp^(2) hybrid orbital in it...

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  16. The melecule that has linear structure is:

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  17. The CI - C - CI angle in 1, 1, 2, 2, tetrachloroethone and tetrachloro...

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  18. Coordinate linkage is formed

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  19. The molecule which has the largest dipole moment amongst the following...

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  20. The number of unpaired electrons in O(2) molecule is

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