Give test to differentiate (Bromobenzene) Ph-Br and benzyl bromide (PhCH₂Br).
(1) (i) aq. KOH (ii) Na

(2) AgNO₃

(3) KMnO₄

(4) All these

Give test to differentiate 1,1-dichloroethane and 1, 2-dichloroethane:
1. 2,4-DNP then aq. KOH

2. aq. KOH then 2, 4-DNP

3. NaHSO₃

4. Lucas reagent

$\mathrm{In} \mathrm{the} \mathrm{dehydration} \mathrm{reaction},$
${\mathrm{CH}}_3{\mathrm{CONH}}_2\stackrel{{\mathrm{P}}_2{\mathrm{O}}_5}{\to }{\mathrm{CH}}_3\mathrm{C}\equiv \mathrm{N},$
$\mathrm{the} \mathrm{hybridization} \mathrm{state} \mathrm{of} \mathrm{carbon} \mathrm{changes} \mathrm{from}:$

(1) sp³ to sp²

(2) sp to sp

(3) sp² to sp

(4) sp to sp³

The reagent used in dehydrohalogenation process is:

(1) alcoholic KOH

(2) NaNH₂

(3) C₂H₅ONa

(4) all of these

The reaction, ${\mathrm{CH}}_2=\mathrm{CHCHO}\stackrel{\mathrm{HX}}{\to }\mathrm{gives}:$

(1) CH₃CHXCHO

(2) CH₂XCHCHO

(3) CH₂=CHCHX₂

(4) none of these

The reagent used in dehalogenation process is:

1. KOH alc.

2. Zn dust+ alc.

3. Na

4. KOH(aq)

Zn-Cu couple used as reducing agent is:

(1) mixture of Zn and Cu powder

(2) copper deposited on granulated zinc

(3) Zn deposited on copper fillings

(4) a rod half made of copper and half made of zinc

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

(1) Chlorination, nitration, reduction

(2) Nitration, chlorination, reduction

(3) Nitration, reduction, chlorination

(4) Nitration, reduction, acylation, chlorination, hydrolysis

An unknown compound A has a molecular formula C₄H₆. When A is treated with excess of Br₂ a new substance B with formula C₄H₆Br₄ is formed. A forms a white ppt. with ammoniacal silver nitrate solution. A may be-

1. But-1-yne

2. But-2-yne

3. But-1-ene

4. But-2-ene

The appropriate reagent for the following transformation,

  is :

(1) Zn(Hg),HCl

(2) NH₂NH₂, OH^-

(3) H₂/Ni

(4) NaBH₄