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

Subtopic:  Oxidizing & Reducing Agents |
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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

Subtopic:  Differentiation of Organic Compound |
 64%
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The appropriate reagent for the following transformation,

  is :

1. Zn(Hg),HCl

2. NH2NH2, OH-

3. H2/Ni

4. NaBH4

Subtopic:  Differentiation of Organic Compound |
 61%
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Which compound would give 5-keto-2-methyl hexanal upon ozonolysis?

1. 2.
3. 4.

Subtopic:  Aldehydes & Ketones |
 68%
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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.

Subtopic:  Differentiation of Organic Compound |
 67%
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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.  \( \mathrm{CH}_3-\left(\mathrm{CH}_2\right)_4-\mathrm{O}-\mathrm{CH}_3 \)
Subtopic:  Ascending and Descending Series |
 73%
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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

Subtopic:  Ascending and Descending Series |
 55%
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R-COOH→ RCH2OH. This mode of reduction can be effected only by:

1. NaBH4

2. KMnO4

3. LiAIH4

4. All of the above

Subtopic:  conversion chart for n to n carbon |
From NCERT
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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

Subtopic:  Differentiation of Organic Compound |
 78%
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CH3CH=CHCHO is oxidized to CH3CH=CHCOOH using:

1. Alkaline permanganate

2. Ammoniacal silver nitrate

3. Selenium dioxide

4. Osmium tetroxide

Subtopic:  Aldehydes & Ketones |
 56%
From NCERT
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