Recent questions tagged organic-chemistry

The correct sequence regarding base strength of aliphatic amines in gaseous phase is

asked Feb 27, 2014 by sreemathi.v

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Optical and isomers are compounds which contain the same number and kinds of atoms, and bonds (ie the connectivity between atoms is the same), and different spatial arrangements of the atoms, but which have non-super imposable mirror images. Each non-super imposable mirror image structure is called an enantiomer. Optical isomers get their name because the plane – polarized light that is passed through a sample of a pure enantiomers is rotated. The planeis rotated in the opposite direction but with the same magnitude when plane- polarized light is passed through a pure sample containing the other enantiomer of a pair. A solution of one enantiomer rotates the plane of polrisation in a clockwise direction. This enantiomer is known as the (+) form. A solution of the other enantiomer rotales the plane of polarisation in an anti-clockwise direction. This enantiomer is known as (-) form.

asked Feb 27, 2014 by meena.p

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The order of increasing basic strength among P-amino benzaldehyde(I),P-nitro aniniline (II) and P-bromo aniline (III) is

asked Feb 27, 2014 by sreemathi.v

1 answer

Optical and isomers are compounds which contain the same number and kinds of atoms, and bonds (ie the connectivity between atoms is the same), and different spatial arrangements of the atoms, but which have non-super imposable mirror images. Each non-super imposable mirror image structure is called an enantiomer. Optical isomers get their name because the plane – polarized light that is passed through a sample of a pure enantiomers is rotated. The planeis rotated in the opposite direction but with the same magnitude when plane- polarized light is passed through a pure sample containing the other enantiomer of a pair. A solution of one enantiomer rotates the plane of polrisation in a clockwise direction. This enantiomer is known as the (+) form. A solution of the other enantiomer rotales the plane of polarisation in an anti-clockwise direction. This enantiomer is known as (-) form.

asked Feb 27, 2014 by meena.p

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The number of resonating structures of below is

asked Feb 27, 2014 by sreemathi.v

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Optical and isomers are compounds which contain the same number and kinds of atoms, and bonds (ie the connectivity between atoms is the same), and different spatial arrangements of the atoms, but which have non-super imposable mirror images. Each non-super imposable mirror image structure is called an enantiomer. Optical isomers get their name because the plane – polarized light that is passed through a sample of a pure enantiomers is rotated. The planeis rotated in the opposite direction but with the same magnitude when plane- polarized light is passed through a pure sample containing the other enantiomer of a pair. A solution of one enantiomer rotates the plane of polrisation in a clockwise direction. This enantiomer is known as the (+) form. A solution of the other enantiomer rotales the plane of polarisation in an anti-clockwise direction. This enantiomer is known as (-) form.

asked Feb 27, 2014 by meena.p

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Which of the following order is correct regarding the relative basicity of amines?

asked Feb 27, 2014 by sreemathi.v

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In the following compounds the order of basicity is

asked Feb 27, 2014 by sreemathi.v

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Which reagent can provide distinction between aliphatic $-NH_2$ group and aromatic $-NH_2$ group?

asked Feb 27, 2014 by sreemathi.v

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In the below reaction,the reactive intermediate formed is

asked Feb 27, 2014 by sreemathi.v

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What would be the reagent in the below reaction

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In the below reaction P is

asked Feb 27, 2014 by sreemathi.v

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What would be the major product on the following reaction?

asked Feb 27, 2014 by sreemathi.v

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Which of the following statement is correct?

asked Feb 27, 2014 by sreemathi.v

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A new carbon-carbon bond formation is possible in

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What would be the product in the below reaction:

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What could be the major product in the below reaction

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Phenol undergoes condensation with acetaldehyde in acidic (or) alkali medium gives

asked Feb 27, 2014 by sreemathi.v

1 answer

Optical and isomers are compounds which contain the same number and kinds of atoms, and bonds (ie the connectivity between atoms is the same), and different spatial arrangements of the atoms, but which have non-super imposable mirror images. Each non-super imposable mirror image structure is called an enantiomer. Optical isomers get their name because the plane – polarized light that is passed through a sample of a pure enantiomers is rotated. The planeis rotated in the opposite direction but with the same magnitude when plane- polarized light is passed through a pure sample containing the other enantiomer of a pair. A solution of one enantiomer rotates the plane of polrisation in a clockwise direction. This enantiomer is known as the (+) form. A solution of the other enantiomer rotales the plane of polarisation in an anti-clockwise direction. This enantiomer is known as (-) form.

asked Feb 27, 2014 by meena.p

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Phenol on exposure to air produces

asked Feb 27, 2014 by sreemathi.v

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In the following compounds

asked Feb 27, 2014 by sreemathi.v

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The below reaction is known as

asked Feb 27, 2014 by sreemathi.v

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The fries rearrangement of the below reaction ,the P is

asked Feb 27, 2014 by sreemathi.v

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Ketanol tautomerism refers to a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol. The enol and keto fprms are said to be tatutomers of each other. The interconversion of the two forms involved the movements of a proton and the shifting of bonding electrons. A compound containing a carbonyl group $(C=0)$ is normally in rapid equilibrium with an enol tautomer, which contains a pair of doubly bonded carbon atoms adjacent to a hydroxyl $(-OH)$ group, $C=C-OH$ For a carbonyl compound to exhibit tautomerism, the essential condition is that, it must have at least one $ \alpha -H$ atom. Generally , the keto form is more stable than the enol form due to the greater strength of the carbon- oxygen $\pi$ bond as compared - carbon $\pi$ bond. In keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto- form , this is due toMaximum enol content is observed in

asked Feb 27, 2014 by meena.p

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Which of the following organic compound shows Keto–enol tautomerism?

asked Feb 27, 2014 by meena.p

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Ketanol tautomerism refers to a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol. The enol and keto fprms are said to be tatutomers of each other. The interconversion of the two forms involved the movements of a proton and the shifting of bonding electrons. A compound containing a carbonyl group $(C=0)$ is normally in rapid equilibrium with an enol tautomer, which contains a pair of doubly bonded carbon atoms adjacent to a hydroxyl $(-OH)$ group, $C=C-OH$ For a carbonyl compound to exhibit tautomerism, the essential condition is that, it must have at least one $ \alpha -H$ atom. Generally , the keto form is more stable than the enol form due to the greater strength of the carbon- oxygen $\pi$ bond as compared - carbon $\pi$ bond. Keto- enol tatutomerism is observed in

asked Feb 26, 2014 by meena.p

1 answer

Ketanol tautomerism refers to a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol. The enol and keto fprms are said to be tatutomers of each other. The interconversion of the two forms involved the movements of a proton and the shifting of bonding electrons. A compound containing a carbonyl group $(C=0)$ is normally in rapid equilibrium with an enol tautomer, which contains a pair of doubly bonded carbon atoms adjacent to a hydroxyl $(-OH)$ group, $C=C-OH$ For a carbonyl compound to exhibit tautomerism, the essential condition is that, it must have at least one $ \alpha -H$ atom. Generally , the keto form is more stable than the enol form due to the greater strength of the carbon- oxygen $\pi$ bond as compared - carbon $\pi$ bond. In keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto- form , this is due to

asked Feb 26, 2014 by meena.p

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The stability of carbanions in the following :

asked Feb 26, 2014 by meena.p

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The most unlikely representation of resonance structure of P-nitrophenoxide ion is

asked Feb 26, 2014 by meena.p

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Which one of the following reagents is used in the below reaction?

asked Feb 26, 2014 by sreemathi.v

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The claisen rearrangement of the below reaction the product is

asked Feb 26, 2014 by sreemathi.v

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Increasing order of stability among the three main conformation (ie eclipse, anti, gauche) of 2- fluoroethanol is

asked Feb 26, 2014 by meena.p

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For $(i) I^-, (ii) Cl^{-}, (iii) Br^{-} $. The increasing order of nuclephilicity would be :

asked Feb 26, 2014 by meena.p

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What would be the major product in the following reaction?

asked Feb 26, 2014 by sreemathi.v

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Which of the following is the correct order of decreasing $SN_2$ reactivity :

asked Feb 26, 2014 by meena.p

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In the following compounds the order of acid strength is

asked Feb 26, 2014 by sreemathi.v

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The order of decreasing stability of the carbanions $(CH_3)_3 C^-(I) ; (CH_3)_2CH^{-1}(II) ; CH_3CH_2^{-}(III); C_6H_5CH_2^{-} (IV)$ is

asked Feb 26, 2014 by meena.p

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If two compounds have same empirical formula but different molecular formulae, they must have,

asked Feb 26, 2014 by meena.p

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Which of the following statement is correct?

asked Feb 26, 2014 by sreemathi.v

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Which of the following conformations cyclohexane is chiral?

asked Feb 26, 2014 by meena.p

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In the below reaction the products A and B are

asked Feb 26, 2014 by sreemathi.v

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Which of the following alkenes will react fastest with $H_2$ under catalytic hydrogenation conditions ?

asked Feb 26, 2014 by meena.p

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Phenols can be prepared by

asked Feb 26, 2014 by sreemathi.v

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Which of the following compounds possesses the $C-H$ bond with the lowest bond dissocation energy :

asked Feb 26, 2014 by meena.p

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In the following reaction :The structure of the major product X is

asked Feb 26, 2014 by sreemathi.v

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An ester (A) with molecular formula $C_9H_{10}O_2$ was treated with excess of $CH_3MgBr$ and the compound so formed was treated with conc.$H_2SO_4$ to form olefin (B).Ozonolysis of B gave ketone with formula $C_8H_8O$ which shows iodoform test positive.The structure of A is

asked Feb 26, 2014 by sreemathi.v

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Given: $CH_3COCH_3$ $\large\xrightarrow[\quad pyrolysis \quad]{700^{\large\circ}C}$ $A$ $\large\xrightarrow {CH_3COOH}$ $B$ $\large\xrightarrow {RCOOH} C$ based on these reactions. Write the structures of A and C

asked Feb 26, 2014 by sreemathi.v

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Refer the below reaction:Compound F gives positive Schiff's test but (E) does not.Give structures of A and F

asked Feb 26, 2014 by sreemathi.v

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An organic acid ($X$) has molecular formula $C_8H_{16}O_2$ $X$ on heating with $NH_3$ forms $Y$ which on treatment with alkaline $Br_2$ forms $Z$.$Z$ on treatment with $HNO_2$ followed by heating with $H_2SO_4$ gives $2$,$4$-dimethyl-$2$-pentene.What are the structures of $X$ and $Z$?

asked Feb 26, 2014 by sreemathi.v

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Which of the following carboxylic acid under goes decarboxylation easily?

asked Feb 26, 2014 by sreemathi.v

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