Unlike phenol, 2,4-dinitrophenol is soluble in sodium carbonate s… - Vidyadip

MCQ

Unlike phenol,$ 2,4-$dinitrophenol is soluble in sodium carbonate solution in water because?

✓
Presence of two $-\mathrm{NO}_2$ groups in the ring makes $2, 4 -$ dinitrophenol a stronger acid than phenol.
B
Presence of two $-\mathrm{NO}_2$ groups in the ring makes $2, 4 -$ dinitrophenol a weaker acid than phenol.
C
presence of two $-\mathrm{NO}_2$ groups make the hydrogen bonding easier, making $2, 4-$dinitrophenol soluble.
D
Nitro group reacts with $\mathrm{Na}_2 \mathrm{CO}_3$ while $-OH$ group does not.

✓

Answer

Correct option: A.

Presence of two $-\mathrm{NO}_2$ groups in the ring makes $2, 4 -$ dinitrophenol a stronger acid than phenol.

Presence of two electron withdrawing $-\mathrm{NO}_2$ groups in the ring makes $2,4-$dinitrophenol a stronger acid than phenol. Hence it react with aqueous $\mathrm{Na}_2 \mathrm{CO}_3$ solution to form sodium salt thus making it soluble in $\mathrm{Na}_2 \mathrm{CO}_3$.

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