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

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.		4.

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:
\(\mathrm{CH}_ 3-\mathrm{CH}_2-\mathrm{CH}=\mathrm{CH}_2 \xrightarrow{\mathrm{HBr} / \mathrm{H}_2 \mathrm{O}_2} \mathrm{Y} \xrightarrow{\mathrm{C}_2 \mathrm{H}_5 \mathrm{O}^{-}\mathrm{Na}^{+}} \mathrm{Z} \)

1.
2.
3.	\( \mathrm{CH}_3-\left(\mathrm{CH}_2\right)_3-\mathrm{O}-\mathrm{CH}_2-\mathrm{CH}_3 \)
4.	\( \mathrm{CH}_3-\left(\mathrm{CH}_2\right)_4-\mathrm{O}-\mathrm{CH}_3 \)

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

$\mathrm{R}-\mathrm{COOH}$$\to$RCH₂OH. This mode of reduction can be effected only by:

1. NaBH₄

2. KMnO₄

3. LiAIH₄

4. All of the above

Propene, CH₃-CH=CH₂ can be converted into 1-propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion?

1. Alkaline KMnO₄

2. B₂H₆ and alk. H₂O₂

3. O₃/zinc dust

4. OsO₄/CHCl₃

CH₃CH=CHCHO is oxidized to CH₃CH=CHCOOH using:

1. Alkaline permanganate

2. Ammoniacal silver nitrate

3. Selenium dioxide

4. Osmium tetroxide