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Q.

Arrange the following in increasing order of their boiling points: 

N-EthylethanamineButanamineN, N- dimethyl ethanamine
                    I           II                     III

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a

III>II>I

b

III>I>II

c

II>III>I

d

II>I>III

answer is D.

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Detailed Solution

As the branching increases, the surface area decreases. This leads to a decrease in boiling point. Among the given compounds, Butanamine has highest boiling point and N, N- dimethyl ethanamine has the least boiling point.

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Arrange the following in increasing order of their boiling points: N-EthylethanamineButanamineN, N- dimethyl ethanamine                    I           II                     III