What is the number of single bonds in C_2 H_6 O? A) 5 B) 6 C) 7 D) 8 True/False:

Question

What is the number of single bonds in C_2 H_6 O? A) 5 B) 6 C) 7 D) 8 True/False: Water has 2 covalent bonds and 2 lone pairs. True/False: Nitrogen trifluoride has 22 valence electrons. What is the chemical name given to the compound whose formula is N_2 O_4? What is the chemical formula of a compound named ammonium sulfide? A) NH_4 S B) (NH_4)_2 S C)(NH_4)S_2 D)(NH_4)_2 S_3 In a molecule having four pairs of electrons around the central atom and a pyramidal shape, how many bonding pairs of electrons does the central atom have? A) 2 B) 1 C) 4 D) 3 Which of the following statements is correct about the pyramidal structure? A) The pyramidal structure is very similar to the tetrahedral structure except one electron pair in the pyramidal structure replaces a bond in the tetrahedral one. B) The pyramidal structure is the shape of the ammonia molecule. C) The bond angles around the central atom very close to the 107 degree. D) All above statements are correct ____

Explanation / Answer

50. There are two possible structure for C2H6O. These are CH3CH2OH and CH3OCH3

Now above two structure contains total 8 single bonds. In CH3CH2OH, there are 5 C-H, 1C-C, 1 C-O and 1 O-H single bonds. In CH3OCH3, there are 6 C-H and 2 C-O single bonds. Therefore above two structure contains total 8 single bonds. So correct option is D) 8

51. Water molecule have central Oxygen atom. It has Sp3 hybridisation. But the geometry of water molecule is bent or angular. Because, oxygen has two lone pairs on it and oxygen binds with two hydrogens with two covalent bonds. Therefore, water has 2 covalent bonds and 2 lone pairs. So the statement is True

52. The Structure of nitrogen trifluoride is written as NF3. In the structure, Nitrogen is central atom and it is attached with 3 Fluorine atom. The valence electrons in Nitrogen are 5 while each Fluorine has 7 valence electrons.

Therefore total number of valence electrons = 5+ 7(3) = 26

53. The chemical name of N2O4 is dinitrogen tetraoxide as it contains 2 nitrogen and 4 oxygen.

54. Ammonium sulfide is generally called as diaamonium sulfide. Therefore it has chemical formula (NH4)2S

So option B) (NH4)2S is correct.

55. The central atom of molecule having pyramidal shape possses a lone pair. Thus, out of four pairs of electrons, one is lone pair and three are bonding pairs. Example is NH3. Central atom N has one lone pair and 3 bonding pairs forming 3 covalent bonds with 3 Hydrogen. NH3 is pyramidal in shape.

So, option D) 3 is correct

56. In tetrahedral structure, there are four bonding pairs of electrons while in pyramidal there are three bonding pairs of electrons and one lone pair of electron. Therefore, one electron pair in the pyramidal structure is replced by a bond in tetrahedral structure. Ammonia molecule is in pyramidal shape as central atom N has one lone pair and 3 bonding pairs forming 3 covalent bonds with 3 Hydrogen. The bond angle in pyramidal structure is less than that of tetrahedral structure due to presency of one lone pair. It is close to 1070. Therefore all the statements are correct.

Option D) All above statements are correct is correct

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