Which of the following possess highest melting point?

• p-dichlorobenzene

• m-dichlorobenzene

• o-dichlorobenzene

• chlorobenzene

The correct order of reactivity of the three halides ethyl chloride (I), iso-propyl chloride (II) and benzyl chloride (III) in S_N1 reaction is :

• I > II > III

• III > II >I

• II > I > III

• I > III > II

The product P is

Identify X.

Consider the following set of reactions :

CH₃COOH $\stackrel{{\mathrm{SOCl}}_2}{\to }$A $\underset{\mathrm{Anhydrous} {\mathrm{AlCl}}_3}{\overset{\mathrm{Benzene}}{\to }}$ B $\stackrel{\mathrm{HCN}}{\to }$ C $\stackrel{\mathrm{HOH}}{\to }$ D

The structure of D would be

What will be compound A in the following reaction?

C(CH₃)₃CH = CH₂ $\underset{\left(\mathrm{ii}\right) {\mathrm{NaBH}}_4, \mathrm{NaOH}}{\overset{\left(\mathrm{i}\right) \mathrm{Hg}({\mathrm{OOCCH}}_3{)}_2/ \mathrm{THF}}{\to }}$ A

What is the name of the following reaction?

PhCHO + (CH₃CO)₂O $\stackrel{\mathrm{Na}(\mathrm{OAc}{)}_2}{\to }$ PhCH = CHCO₂H

• Oxymercuration demercuration reaction

• Cannizzaro reaction

• Knoevenagel's reaction

• Perkin reaction

Which one of the following does not give white precipitate with acidified silver nitrate solution?

• 

• CH₂ = CH - Cl

• CH₂ = CH - CH₂ - Cl

• Both (a) and (b)

79.

Oil used as frothing agent in froth-floatation process is

• pine oil

• mustard oil

• coconut oil

• olive oil

In the presence of ether , 2-choloropropane reacts with sodium and form :

• n-hexane

• 2 , 3 - dimethyl butane

• n - hexene

• CH₃$—$CH$=$CH₂