In the series ethane, ethylene and acetylene, the C - H bond energy is

1.  The same in all the three compounds

2.  Greatest in ethane

3.  Greatest in ethylene

4.  Greatest in acetylene

Subtopic:  Covalent Bond |
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The bond order depends on the number of electrons in the bonding and antibonding orbitals. Which of the following statements are correct about bond order?

1.  Bond order can have a negative value.

2.  It always has an integral value.

3.  It is a nonzero quantity

4.  It can assume any value-positive or integral or fractional, including zero upto four.

Subtopic:  Types of Chemical Bond |
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What is the best description of the geometry of the nitrogen atoms in dimethylnitrosamine, CH32NNO?

         N bounded to CH3 groups                       N bonded to O

1.  Trigonal planar                                         Linear

2.  Trigonal planar                                         Bent

3.  Trigonal pyramidal                                   Linear

4.  Trigonal pyramidal                                   Bent

Subtopic:  Hybridisation |
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The following diagram is sometimes used to illustrates the structure of benzene C6H6

Which of the statements concerning the structure of benzene is false?

1.  The double bonds oscillate rapidly back and forth between adjacent pairs of carbon atoms

2.  The H -C -C angles are 120°

3.  The carbon atoms form a flat hexagonal ring

4.  Above structures are resonance structures

Subtopic:  Types of Chemical Bond |
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The diamagnetic species is

1. NO

2. NO2

3. O2

4. CO2

Subtopic:  M.O.T |
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Consider the Lewis structure given below for the CH3CCH molecule

                          

What is the maximum number of atoms that can lie in the same plane?

1.  Three

2.  Four

3.  Five

4.  Six

 

Subtopic:  Hybridisation |
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How many carbon-carbon double bonds are present in linolenic acid, α-C17H29COOH?

1.  1

2.  2

3.  3

4.  4

Subtopic:  Covalent Bond |
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The formulae and boiling points of three compounds are given in this table.

The trend in boiling points is best attributed to variations in

1.  Covalent bonding

2.  Dipole forces

3.  Dispersion forces

4.  Hydrogen bonding

Subtopic:  Polarity |
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Three monosulfur fluorides are known : SF2, SF4 and SF6. Of these, polar species include

1.  SF2 Only

2.  SF4 Only

3.  SF2 and SF4 Only

4.  SF2SF4 and SF6

Subtopic:  Polarity |
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Which ionic compound has the largest lattice energy?

1.  LiF

2.  BeO

3.  KBr

4.  CaS

Subtopic:  Lattice & Hydration Energy |
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