N-Ethyl-N-methyl propanamine does not show optical activity why?

The energy difference between (I)and (II) is very small, these are rapidly interverted 

into each other hence are non resolvable. This is called nitrogen inversion or 

umbrella effect.

Related Questions:

Arrange the following in the increasing order of their acid strength : Methyl amine, Dimethyl amine, Aniline, N-methyl aniline (I.I.T, 1988).

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N-Ethyl-N-methyl propanamine does not show optical activity why?

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