JEE MAIN - Chemistry (2019 - 11th January Evening Slot - No. 2)
In the following compound,
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the favourable site/s for protonation is/are :
the favourable site/s for protonation is/are :
(b), (c) and (d)
(a) and (e)
(a) and (d)
(a)
Explanation
At (a) position lone pair of N atom is in resonance with $$\pi $$ bond so lone pair can't donate easily to H+ ion.
At (b) position N atom is directly connected with double bond so lone pair of N atom don't perticipate in resonance so lone pair can be donated easily to H+ ion.
At (c) position N atom is directly connected with double bond so lone pair of N atom don't perticipate in resonance so lone pair can be donated easily to H+ ion.
At (d) position N atom is directly connected with double bond so lone pair of N atom don't perticipate in resonance so lone pair can be donated easily to H+ ion.
At (e) position lone pair of N atom is in resonance with $$\pi $$ bond so lone pair can't donate easily to H+ ion.
$$ \therefore $$ (b), (c) and (d) are the favourable sites for protonation.
At (b) position N atom is directly connected with double bond so lone pair of N atom don't perticipate in resonance so lone pair can be donated easily to H+ ion.
At (c) position N atom is directly connected with double bond so lone pair of N atom don't perticipate in resonance so lone pair can be donated easily to H+ ion.
At (d) position N atom is directly connected with double bond so lone pair of N atom don't perticipate in resonance so lone pair can be donated easily to H+ ion.
At (e) position lone pair of N atom is in resonance with $$\pi $$ bond so lone pair can't donate easily to H+ ion.
$$ \therefore $$ (b), (c) and (d) are the favourable sites for protonation.
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