Recent questions tagged basic-organic-chemistry

When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. How many isomeric alkenes on catalytic reduction gives 3- methylhexane ?

asked Feb 27, 2014 by meena.p

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When a carbon atom is linked to four different groups it is said to be chiral carbon atom. when alpha hydrogen atom of an alkane is replaced by a functional group we get corresponding compound. How many C- atoms are present in lowest molecular mass optically active alkane?

asked Feb 27, 2014 by meena.p

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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

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

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

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

asked Feb 26, 2014 by meena.p

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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 conformations cyclohexane is chiral?

asked Feb 26, 2014 by meena.p

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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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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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Toutomerism is not exhibited by

asked Feb 26, 2014 by meena.p

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The compound , whose stereo-chemical formula is written below exhibits x geometrical isomers and y optical isomers.

asked Feb 26, 2014 by meena.p

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Out of the following , the one containing only nucleophiles is

asked Feb 26, 2014 by meena.p

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Which of the following rings in most strained ?

asked Feb 26, 2014 by meena.p

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The total number of carboxylic acid groups in the product P is :

asked Feb 26, 2014 by meena.p

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An organic compound A upon reacting with $NH_3$ gives B. On heating B gives C. C in presence of $KOH$ reacts with $Br_2$ to give $CH_3CH_2NH_2$ A is :

asked Feb 25, 2014 by meena.p

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Compound $(A),C_8H_9Br$ gives a white precipitate when warmed with alcoholic $AgNO_3$. Oxidation of $(A)$ gives a acid $(B)$. $C_8H_6O_4.(B)$ easily forms anhydride on heating . Identify the compound $(A)$.

asked Feb 25, 2014 by meena.p

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The IUPAC name of the compound :$CH_2 =CH-CH(CH_3)_2$

asked Feb 25, 2014 by meena.p

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How many optically active stereoisomers are possible for butane$-2, 3-$diols?

asked Feb 25, 2014 by meena.p

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The number of structural isomers for $C_6H_{14}$ is

asked Feb 25, 2014 by meena.p

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The IUPAC name of the compound

asked Feb 25, 2014 by meena.p

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The compound which gives the most stable carbonium ion on dehydration is

asked Feb 25, 2014 by meena.p

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Which of the following represents the given mode of hybridisation $Sp^2-Sp^2-Sp-Sp$ from left to right?

asked Feb 25, 2014 by meena.p

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Refer the below figure: Compound on hydrolysis in aqueous acetone will give,

asked Feb 25, 2014 by meena.p

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The correct statements about the compound: $H_3C(HO)HC - CH = CH -CH(OH)CH_3 (X)$ are:

asked Feb 25, 2014 by meena.p

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The correct statement(s) concerning the structures $E, F$ and $G$ is (are) (i) E,F and G are resonance structures (ii) E,F and E,G are tautomers (iii) F and G are geometrical isomers. (iv) F and G are diastereomers.

asked Feb 25, 2014 by meena.p

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The correct statements about the compound given below is (are) (i) The compound is optically active. (ii) The compound possesses centre of symmetry (iii) The compound possesses plane of symmetry (iv) The compound possesses axis symmetry.

asked Feb 25, 2014 by meena.p

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Tautomerism is exhibited by

asked Feb 25, 2014 by meena.p

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Which of the following compounds will show geometrical isomerism?(i) 2-butene (ii) Propene (iii) 1-phenylpropene (iv) 2-methyl-2-butene

asked Feb 25, 2014 by meena.p

2 answers

Only two isometric monochloro derivatives are possible for : (i) n-butane (ii) 2,4 -dimethylpentane (iii) benzene (iv) 2- methylpropane

asked Feb 25, 2014 by meena.p

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Dipole moment is shown by (i) 1,4 dichlorobenzene (ii) cis-1,2-dichloroethane. (iii) trans -1,2- dichleroethene (iv) trans-1,2- dichloro-2-pentene.

asked Feb 25, 2014 by meena.p

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Phenol is less acidic than (i) acetic acid (ii) p-methoxyphenol (iii) p- nitrophenol (iv) ethanol

asked Feb 24, 2014 by meena.p

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Resonance structure of a molecule should (i) Identical arrangements of atoms. (ii) nearly the same energy content. (iii) the same number of paired electrons. (iv) identical bonding

asked Feb 24, 2014 by meena.p

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The major product of the following reaction is :

asked Feb 24, 2014 by meena.p

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Arrange in order of decreasing trend towards ES (electrophilic substitution) reactions: Chlorobenzene (I), Benzene (II), Anilinium chloride (III), Toluene (IV)

asked Feb 24, 2014 by meena.p

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Among the following , the molecule with the highest dipole moment is :

asked Feb 24, 2014 by meena.p

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The correct stability order for the following species is

asked Feb 24, 2014 by meena.p

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In the following compounds?

asked Feb 24, 2014 by meena.p

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Give the numbers of N and M?

asked Feb 24, 2014 by meena.p

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The correct acidity order of the following is :

asked Feb 24, 2014 by meena.p

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