The correct IUPAC name, among the following, is-

1. Prop-3-yn-1-ol 2. But-4-ol-4-yne
3. But-3-ol-2-yne 4. But-3-yn-1-ol

Subtopic:  Nomenclature |
 70%
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The number of σ and π bonds in the molecule C6H6 are -

1. 6 C – C sigma ( σ C - C )  bonds, 5 C–H sigma ( ( σ C - H )  bonds, and 3 C=C pi ( π C - C ) 
2. 6 C – C sigma ( σ C - C )  bonds, 5 C–H sigma ( ( σ C - H )  bonds, and 2 C=C pi ( π C - C ) 
3. 6 C – C sigma ( σ C - C )  bonds, 6 C–H sigma ( ( σ C - H )  bonds, and 3 C=C pi ( π C - C ) 
4. 6 C – C sigma ( σ C - C )  bonds, 6 C–H sigma ( ( σ C - H )  bonds, and 2 C=C pi ( π C - C ) 

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 88%
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The correct hybridization states of carbon atoms in the following compound are -     C1H2=C2H-C3N
 

1. C1= sp , C2= sp, C3= sp2 2. C1= sp2 , C2= sp,  C 3 = sp3
3. C1= sp2 , C2= sp,  C 3 = sp 4. C1= sp3 , C2= sp,  C 3 = sp3
Subtopic:  Hybridisation & Structure of Carbon Compounds |
 91%
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In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. The percentage of sulphur in the compound is-

1. 39.10 %

2. 48.13 %

3. 42.10 %

4. 52. 43 %

Subtopic:  Qualitative Analysis of Organic Compounds |
 65%
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The chiral compound among the following is:

1. 2-Methylpentanoic acid 2. Pentanoic acid
3. 4-Methyl pentanoic acid 4. None of the above
Subtopic:  Stereo Isomers |
 71%
From NCERT
AIPMT - 1999
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Match Column I with Column II.

Column I Column II
A. Dumas method 1. AgNO3
B. Kjeldahl’s method 2. Silica gel
C. Carius method 3. Nitrogen gel
D. Chromatography 4. Ammonium sulphate

Codes

A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Quantitative Analysis of Organic Compounds |
 74%
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Match the type of mixture of compounds in Column I with the technique of separation/purification given in column II.

Column I Column II
A. Two solids which have different solubilities in a solvent and which do not undergo a reaction when dissolved in it 1. Steam distillation
B. Liquid that decomposes at its boiling point 2. Fractional distillation
C. Steam volatile liquid 3. Crystallisation
D. Two liquids that have boiling points close to each other 4. Distillation under reduced pressure

Codes

A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Purification of Organic Compounds |
 84%
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The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H+ ion on the double bond portion. The same can be shown as-

1. 2.
3. 4. All of these are possible
Subtopic:  Nucleophile & Electrophile |
From NCERT
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The correct representation involving heterolytic fission of CH3-Br among the following is:

1.
2.
3.
4.
Subtopic:  Bond Cleavage & Isomerism |
 83%
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The most stable carboxylate ion among the following is-

1. CH3-C||O-O-

2. Cl-CH2-C||O-O-

3. F-CH2-C||O-O-

4. (F)2-CH-C||O-O-

Subtopic:  Electron Displacement Effects |
 79%
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