Q.
Regarding phenol the correct statement are
A) It reacts with to give a mixture of o-bromophenol and p - bromophenol
B)In Reimer-Tiemann reaction, on treating phenol with chloroform in the presence of sodium 1 hydroxide, a - CHO group is introduced at ortho position of benzene ring.
C) In Kolbe’s reaction it gives salicylic acid
D) On oxidation with it gives a conjugated diketone
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a
A,B,C only
b
B,C,D only
c
A,B,C,D
d
C,D only
answer is C.
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Detailed Solution
- Phenol reacts with bromine in CS2 at low temperature to give o and p-bromophenol.
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- In Reimer-Tiemann reaction, on treating phenol with chloroform in the presence of sodium 1 hydroxide, a - CHO group is introduced at ortho position of benzene ring.
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- Sodium phenoxide is generated by treating phenol with sodium hydroxide. It is treated with carbon dioxide to form ortho-hydroxy benzoic acid(salicylic acid).
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- The product formed when phenol is treated with acidified solution of Na2Cr2O7 is benzoquinone a conjugated diketone. It is an oxidation reaction.
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