In the Reimer-Tiemann reaction,phenol is converted into salicylaldehyde through an intermediate. The structure of the intermediate is . . . . . . .

  • A
    Option A
  • B
    Option B
  • C
    Option C
  • D
    Option D

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What is the increasing order of boiling points for the following alcohols?
$I.$ $1, 2-$dihydroxybenzene
$II.$ $1, 3-$dihydroxybenzene
$III.$ $1, 4-$dihydroxybenzene
$IV.$ hydroxybenzene

Product $(A)$ is

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The number of $\sigma$ bonds in carbolic acid is

The major product of the following reaction is:

The reaction sequence is as follows: $C_6H_5SO_3H$ $\xrightarrow[(ii) H^+]{(i) NaOH} P$ $\xrightarrow{Na_2Cr_2O_7, H_2SO_4} Q$. The ratio of $\sigma$ bonds to $\pi$ bonds in $Q$ is:

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