order of basic strength 2 is the least basic as the lone pair is involved in aromatizing the ring
1 is the maximum basic as one of the lone pairs is used to aromatize the ring and the other lone pair is available
but how do we distinguish between 3 and 4
the options are:
a.1&gt;3&gt;4&gt;2
b.3&gt;2&gt;4&gt;1
c.4&gt;3&gt;2&gt;1
d.3&gt;4&gt;2&gt;1
by the above discussion we can make out that the answer is a.
but how to distinguish between option 3 and 4. how can we say that 3 is more basic than 4.
I think 4 should me more basic than 3 since $ -CH_3 $ has $ +I $ effect due to which electron density on $N$ increases.