The correct order of boiling point is

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1 $°$ amine >2 $°$ amine >3 $°$ amine

1 $°$ amine <2 $°$ amine <3 $°$ amine

1 $°$ amine <2 $°$ amine >3 $°$ amine

1 $°$ amine >2 $°$ amine <3 $°$ amine

answer is A.

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Detailed Solution

If any molecule has inter molecular hydrogen bonding, then the boiling point of that molecule increased and it makes that the substance has less volatile. Primary amine ( 1 $°$ amine ) has strong intermolecular H-bonding because it forms more number of hydrogen bonding with other molecules. Secondary amine ( 2°amine ) has a weak intermolecular H-bonding since there are less number of hydrogen atoms are present in 2°amine . Finally, tertiary amine ( 3 $°$ amine ) do not form intermolecular H-bonding due to lack H atoms in it. Thus, the correct order of boiling point is 1 $°$ amine> 2 $°$ amine >3 $°$ amine

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