The reaction of elemental sulphur with a Grignard reagent followed by acidification leads to the formation of:

  • A
    mercaptan
  • B
    sulphoxide
  • C
    thioether
  • D
    sulphonic acid

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Match the items given in column $-I$ with the items given in column $-II$.
column $-I$ column $-II$
$(A)$ Antifreeze used in car engine $(1)$ Neutral $FeCl_3$
$(B)$ Solvent used in perfumes $(2)$ Glycerol
$(C)$ Starting material for picric acid $(3)$ Methanol
$(D)$ Wood spirit $(4)$ Phenol
$(E)$ Reagent used for detection of phenolic group $(5)$ Ethylene glycol
$(F)$ By-product of soap industry used in cosmetics $(6)$ Ethanol

Match the compounds in Column-$I$ with their $C-O$ bond length in Column-$II$ and $C-O-H$ bond angle in Column-$III$.
Column-$I$ (Name) Column-$II$ ($C-O$ bond length) and Column-$III$ ($C-O-H$ angle)
$A$. Methanol $1$. $141 \ pm$,$i$. $109^o$
$B$. Phenol $2$. $136 \ pm$,$ii$. $111.7^o$
$C$. Methoxymethane $3$. $142 \ pm$,$iii$. $108.9^o$

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Identify $m$-cresol $(A)$,catechol $(B)$ and resorcinol $(C)$ from the following structures:

Identify $B$ and $D$ in the following sequence of reactions.

Explain the following with an example.
$(i)$ Kolbe's reaction.
$(ii)$ Reimer-Tiemann reaction.
$(iii)$ Williamson ether synthesis.
$(iv)$ Unsymmetrical ether.

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