Amines Test - 5...

Which of the following compounds has the lowest boiling point?

$$C$$ and $$D$$ in the given sequence are :

Among the following the weakest base is:

Arrange the following resonating structure according to their contribution towards resonance hybrid?
(a) $$CH_2=\overset {\oplus}{N}=\overset {\ominus}{N}$$ (b) $$\overset {\ominus}{C}H_2-N=\overset {\oplus}{N}:$$ (c) $$\overset {\oplus}{C}H_2-\underset {. .}{N}=\overset {\ominus}{N}$$ (d) $$\overset {\ominus}{C}H_2-\overset {\oplus}{N}\equiv \overset {. .}{N}$$

The correct order of increasing basic nature of the following base is :

Arrange in decreasing order of basic strength :

The basic character of substituted anilines (I to IV) are such that :

Iso-propyl amine is a:

Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is: 
I. $$H_3N^+ - CH(CH_3)CO_2H$$
II. $$H_2N - CH(CH_3)CO_2^-$$
III. $$H_3N^+ - CH(CH_3)CO_2^-$$
IV. $$H_2N -CH(CH_3)CO_2H$$

Arrange the following in the increasing order of the $$\displaystyle{pK}_b$$ values: