Select the incorrect statement/s about the following compounds; CH3NH2, CH3NHCH3

Question

Select the incorrect statement/s about the following compounds;

CH3NH2, CH3NHCH3, and (CH3)3N

A)All of these are polar molecules

B)The boiling point of (CH3)3N can be expected to be less than that of CH3NHCH3 due to lack of H-bonding that cannot be compensated by the increased dispersion forces (the difference in total number of electrons is less than 15)  

C)All three compounds have dispersion forces and the polarizability increases in the order shown below, as the number of electrons increases;

CH3NH2 < CH3NHCH3 < (CH3)3N

D)The boiling point of (CH3)3N can be expected to be greater than that of CH3NH2 as the increased dispersion forces compensate for the lack of H-bonding interactions in (CH3)3N

E)All three compounds can have H-bonding interactions

CH3NH2, CH3NHCH3, and (CH3)3N

Explanation / Answer

The statements which are false are as follows:

c) All three compounds have dipersion forces and the polarizability increases in the order shown below as the number of electron increases:

This statement is false the order of dipersion is in the increasing order not in decreasing order

CH3NH2>CH3NHCH3>(CH3)3N

d) The boiling point of (CH3)3N can be expected to be greater than that of CH3NH2 as the increased dispersion forces compensate for the lack of H-bonding interactions in (CH3)3N

This statement is false the boiling point of teritiary amines is much lower than primary amine due to the lack of hydrogen bonding interaction.

e) All the three compounds have H-bonding interaction i.e CH3NH2,CH3NHCH3,(CH3)3N

Tertiary amine cannot have hydrogen bonding interaction but they can form hydrogen bonding with water

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