21.

Friedel-Craft's reaction using MeCl and anhydrous AlCl₃ will take place most efficiently with

• benzene

• nitrobenzene

• acetophenone

• toluene

Under identical conditions, the S_N1 reaction will occur most efficiently with

• tert-butyl chloride

• 1-chlorobutane

• 2-methyl-1-chloropropane

• 2-chlorobutane

An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc.H₂SO₄ and cone. HNO₃. Indicate the correct statement from the following.

• p-nitrotoluene is formed in excess

• equimolar amounts of p-nitrotoluene and p-nitrochlorobenzene are formed

• p-nitrochlorobenzene is formed in excess

• m-nitrochlorobenzene is formed in excess

Among the following carbocations:
Ph₂C⁺CH₂Me (I), PhCH₂CH₂CH⁺Ph (II),Ph₂CHCH⁺Me (III) and Ph₂C(Me)CH₂ (IV), the order of stability is

• IV > II > I > III

• I > II > III > IV

• II > I > IV > III

• I > IV > III > II

Li occupies higher position in the electrochemical series of metals as compared to Cu since

• the standard reduction potential of Li⁺/Li is lower than that of Cu²⁺ /Cu

• the standard reduction potential of Cu²⁺/Cu is lower than that of Li⁺/Li

• the standard oxidation potential of Li/Li⁺ is lower than that of Cu/Cu²⁺

• Li is smaller in size as compared to Cu

58.4 g of NaCl and 180 g of glucose were separately dissolved in l000 mL of water. Identify the correct statement regarding the elevation of boiling point (b.p) of the resulting solutions.

• NaCl solution will show higher elevation of boiling point

• Glucose solution will show higher elevation of boiling point

• Both the solutions will show equal elevation of boiling point

• The boiling point elevation will be shown by neither of the solutions

Which of the following will show a negative deviation from Raoult's law?

• Acetone-benzene

• Acetone-ethanol

• Benzene-methanol

• Acetone-chloroform

The equivalent weight of K₂Cr₂O₇ in acidic medium is expressed in terms of its molecular weight (M) as

• M/3

• M/4

• M/6

• M/7

The number of acidic protons in H₃PO₃ are

• 0

• 1

• 2

• 3

When H₂O₂ is shaken with an acidified solution of K₂Cr₂O₇ in the presence of ether, the ethereal layer turns blue due to the formation of

• Cr₂O₃

• Cr₂(SO₄)₃

• CrO₅