The enolic form of ethyl acetoacetate is given below 

 

The number of σ and π bonds in the enolic form are respectively-

1. 18 sigma bonds and 2 pi-bonds
2. 16 sigma bonds and 1 pi-bond
3. 9 sigma bonds and 2 pi-bonds
4. 9 sigma bonds and 1 pi-bond

Subtopic:  Hybridisation & Structure of Carbon Compounds |
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The total number of pi-bond electrons in the following structure are :
1. 4
2. 8
3. 12
4. 16
Subtopic:  Hybridisation & Structure of Carbon Compounds |
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In Kjeldahl’s method for estimation of nitrogen present in the soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H2SO4 . The percentage of nitrogen in the soil is-
1. 37.33
2. 45.85
3. 25.75
4. 43.13

Subtopic:  Qualitative Analysis of Organic Compounds |
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The structure of the compound whose IUPAC name is 3-Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is-

1. 

2.  

3.  

4. 

Subtopic:  Nomenclature |
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The radical,  is aromatic because it has:
1. 7 p-orbitals and 6 unpaired electrons
2. 7 p-orbitals and 7 unpaired electrons
3. 6 p-orbitals and 7 unpaired electrons
4. 6 p-orbitals and 6 unpaired electrons
Subtopic:  Hybridisation & Structure of Carbon Compounds |
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The correct order of increasing bond length of  C-H, C-O, C-C and C=C is-

1.  C-C<C=C<C-O<C-H

2.  C-O<C-H<C-C<C=C

3.  C-H<C-O<C-C<C=C

4.  C-H<C=C<C-O<C-C

Subtopic:  Hybridisation & Structure of Carbon Compounds |
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In Duma’s method of estimation of nitrogen 0.35 of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be -
(Aqueous tension at 300K= 15 mm)

1.  16.45
2.  17.45
3.  14.45
4.  15.45

Subtopic:  Quantitative Analysis of Organic Compounds |
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The Lassaigne’s extract is boiled with conc. HNO3 while testing for halogens, because it- 

1. Helps in the precipitation of AgCl
2. Increases the solubility product of AgCl
3. Increases the concentration of NO3- ions
4. Decomposes Na2S and NaCN, if formed

Subtopic:  Qualitative Analysis of Organic Compounds | Quantitative Analysis of Organic Compounds |
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The most reactive compound towards electrophilic reagent among the following is-

1.   option

2.    option

3.   option

4.    option

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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The most stable conformation of n-butane among the following is:
1. 
2. 
3.  
4.   

Subtopic:  Conformational Isomers |
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