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)

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

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis?

1.		2.
3.

The reduction of an alkyne to alkene using Lindlar's catalyst results into:

(1) cis-addition of hydrogen atoms

(2) trans-addition of hydrogen atoms

(3) a mixture obtained by cis- and trans-additions of hydrogen which are in equilibrium with each other

(4) a mixture obtained by cis- and trans-additions of hydrogen atoms which are not in equilibrium with each other.

Identify Z in the sequence,

$\mathrm{CH}3-{\mathrm{CH}}_2-\mathrm{CH}={\mathrm{CH}}_2\stackrel{\mathrm{HBr}/{\mathrm{H}}_2{\mathrm{O}}_2}{\to }\mathrm{Y}\stackrel{{\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{O}}^{-}-{\mathrm{Na}}^{+}}{\to }\mathrm{Z}:$

1. $\mathrm{CH}3-\underset{{\mathrm{CH}}_3}{\underset{\mathrm{I}}{\mathrm{CH}}}-{\mathrm{CH}}_2-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

2. $\mathrm{CH}3-{\mathrm{CH}}_2-\underset{{\mathrm{CH}}_3}{\underset{\mathrm{I}}{\mathrm{CH}}}-{\mathrm{CH}}_2-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

3. ${\mathrm{CH}}_3-({\mathrm{CH}}_2{)}_3-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

4. ${\mathrm{CH}}_3-({\mathrm{CH}}_2{)}_4-\mathrm{O}-{\mathrm{CH}}_3$

Acetylene can be converted to higher alkyne using the following sequence of reactions:

(1) Na,RX

(2) RMg X,R X

(3) either of these two

(4) none of these