The reaction of hydrogen bromide with propene in absence of peroxide is an example of a/an

1

(a)

free radical addition

(b)

nucleophilic addition

(c)

electrophilic substitution

(d)

electrophilic addition

Which of the following halogen-exchange reaction will occur?

1

(a)

R-I+NaCl

(b)

R-F+KCl

(c)

R-Cl+NaI

(d)

CH₃ -F+AgBr

Which of the following compounds has the highest boiling point?

1

(a)

CH₃CH₂CH₂Cl

(b)

CH₃CH₂CH₂CH₂Cl

(c)

CH₃CH(CH₃)CH₂Cl

(d)

(CH₃)₃CCl

Which one of the following forms propanenitrile as the major product?

1

(a)

Ethyl bromide ||+ alcoholic KCN

(b)

Propyl bromide+alcoholic KCN

(c)

Propyl bromide +alcoholic AgCN

(d)

Ethyl bromide+alcoholic AgCN

The intermidiate during the addition of HCI to propane in presence of peroxide is

1

(a)

CH₃\(\overset { \bullet }{ C } \)HCH₂ CI

(b)

CH₃\(\overset {+ }{ C } \)CH₃

(c)

CH₃CH₂\(\overset { \bullet }{ C } \)H₂

(d)

CH₃CH₂\(\overset {+ }{ C } \)H₂

The compound,

C₇H₈  \(\xrightarrow { 3{ CI }_{ 2 }/\triangle } A\xrightarrow { Br_{ 2 }/Fe } B\xrightarrow { Zn/HCI } C\)

The compound C is

1

(a)

o-Bromotoluene

(b)

m-Bromotoluene

(c)

p-Bromotoluene

(d)

3-Bromo-2,4,6-trichlorotoluene

Arrange the following : CH₃CH₂CH₂CI (I), CH₃CH₂CHCICH₃ (II), (CH₃)₂CHCH₂CI (III) and(CH₃)₃C^__CI (IV) in order of decreasing tensency towards S_N2 reactions

1

(a)

I > III > II > IV

(b)

III > IV > II > I

(c)

II > I > III > IV

(d)

IV > III > II > I

Which reagent will you use for the following reaction?
CH₃CH₂CH₂CH₃ \(\longrightarrow\) CH₃CH₂CH₂CH₂Cl+CH₃CH₂CHClCH₃

1

(a)

Cl₂/UV light

(b)

NaCl+H₂SO₄

(c)

Cl₂ gas in dark

(d)

Cl₂ gas in the presence of iron in dark

Alkyl halides are prepared from alcohols by treating with

1

(a)

HCl+ZnCl₂

(b)

Red P+Br₂

(c)

H₂SO₄+KI

(d)

All the above

In the following reaction,

C6H5CH2Br \(\xrightarrow [ (ii){ H }_{ 3 }{ O }^{ + } ]{ (i)Mg,ether } \)

the product 'X' is

1

(a)

C₆H₅CH₂OCH₂C₆H₅

(b)

C₆H₅CH₂OH

(c)

C₆H₅CH3

(d)

C₆H₅CH₂CH₂C₆H₅

Explain why thionyl chloride method is preferred for preparing alkyl chlorides from alcols?

1

(a)

Because the products of the reaction . i.e., SO₂ and HCI being gases escape into the atmosphere leaving behind alkyl chorides in almost pure state. 

Hydrolysis of 2-bromo-3-methylbutane yields only.............

1

(a)

2-Methyl-2-butanol

Draw the structure of the following compound: 4-bromo-3-methylpent-2-ene.

1

(a)

Why is the solubility of haloalkanes in water very low?

3

(a)

It is because haloalkanes are less polar and cannot form H-bonds with water.

Which one in the following pairs undergoes S_N1 substitution reaction faster and why?

3

(a)

How will you bring about the conversion : methyl bromide to methyl iodide ?

3

(a)

How can you obtain iodoethane from  ethanol when no other iodine containing reagent except NaI is available in the laboratory?

5

(a)

Write the equations for the preparation of 1-iodobutane from:
(a) 1-iodobutane from:
(b) 1-butanol
(c) but-1-ene.

5

(a)

Benzene on reaction with HOCI in presence of an acid produces organic compound (A), (A) on treatment with NaNH₂/liq. NH₃ furnishes another organic compound (B). (B) on treatment with HBF₄ affords an organic compound (C) wich on heating with NaNO₂ gives organic compound (D). Identify (A), (B), (C) and (D).

5

(a)