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 |
 63%
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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.

Subtopic:  Aldehydes & Ketones |
 67%
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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 |
 66%
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Identify Z in the sequence,

CH3-CH2-CH=CH2HBr/H2O2YC2H5O--Na+Z:

1. CH3-CHICH3-CH2-O-CH2-CH3

2. CH3-CH2-CHICH3-CH2-O-CH2-CH3

3. CH3-(CH2)3-O-CH2-CH3

4. CH3-(CH2)4-O-CH3

Subtopic:  Ascending and Descending Series |
 72%
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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 |
 77%
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CH3CH=CHCHO is oxidized to CH3CH=CHCOOH using-

1. Alkaline permanganate

2. Ammoniacal silver nitrate

3. Selenium dioxide

4. Osmium tetraoxide

Subtopic:  Aldehydes & Ketones |
 56%
From NCERT
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An alkene, obtained by the dehydration of an alcohol(A), on ozonolysis gives two molecules of acetaldehyde for every molecule of alkene. the alcohol (A) is:

1. CH3CH2CH2OH

2. CH3CH2OH

3. CH3CH=CHCH2OH

4. CH3CH2CHIOHCH3

 

Subtopic:  Differentiation of Organic Compound |
 63%
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