Question

Which of the following statements is/are correct?

• A. Phenyl vinyl ether (I) will decolourise $Br _{2} / CCl _{4}$ solution but ethyl phenyl ether (II) will not.
• B. 4-Fluorophenol (III) is a stronger acid than 4-methyl phenol (IV).
• C. 3-Nitrophenol (V) is a stronger acid than 4-nitro-phenol (VI).
• D. 4-Chlorophenol (VII) is a stronger acid than 4-fluorophenol (VIII).

Answer 1

Answer: (A), (B), (D)

(1) due to the presence of $( C = C )$ bond, reacts with $Br _{2}$ by addition (thus, decolourise $Br _{2}$ solution) but II does not.
(2) Due to-I effect of $F$ in (III), it is a stronger acid than (IV) (+I effect of (Me) group).
(3) Wrong statement.
(4) Refer to Section $4.10$ (c).