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Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

Study the given diagram. 3 moles of gas is put through a series of thermodynamic changes as shown graphically in a cyclic process. The processes A $\rightarrow$ B, B $\rightarrow$ C and C $\rightarrow$ A respectively are

asked Feb 27, 2014 by mosymeow_1

1 answer

The densities of NaCl crystal as measured by Spectrometer and X - ray method are $2.165\times10^3 kgm^{-3}$ and $2.178\times10^3 kgm^{-3}$, respectively . The fraction of unoccupied sites in sodium chloride crystal is

asked Feb 27, 2014 by sharmaaparna1

1 answer

$CsBr$ crystallises in a body centered cubic lattice. The unit cell length is $436.6\; pm$ . Given that the atomic mass of $Cs = 133$ and of $Br = 80\; amu$. Avogadro's number being $6.02\times10^{23}mol^{-1}$ The density of $CsBr$ is

asked Feb 27, 2014 by sharmaaparna1

1 answer

Silver (atomic weight = $107.88$) crystallises with f.c.c lattice for which the side length of the unit cell is $4.0774\overset{\circ}{A}$. Density of $Ag$ is $10.53\; g\;cm^{-3}$. Calculate the Avogadro's number.

asked Feb 27, 2014 by sharmaaparna1

1 answer

A match box exhibits :

asked Feb 27, 2014 by sharmaaparna1

1 answer

The angle at which first order reflection will occur when X-ray of wavelength $1.54A^{\large\circ}$ are diffracted by the atoms of a crystal ; the interplanar distance is $4.04A^{\large\circ}$

asked Feb 27, 2014 by sharmaaparna1

1 answer

CsBr has b.c.c structure with edge length $4.3 A^{\large\circ}$. The shortest inter ionic distance between $Cs^+$ and $Br^-$ is

asked Feb 27, 2014 by sharmaaparna1

1 answer

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.An optically active hydrocarbon $(A) C_6H_{10}$ on catalytic reduction gives optically inactive hydrocarbon . structure of $(A )$ is

asked Feb 27, 2014 by meena.p

1 answer

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. IUPAC name for lowest molecular mas optically active alkene is

asked Feb 27, 2014 by meena.p

1 answer

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. Lowest molecular mass optically active ketone contians ____ carbon atoms?

asked Feb 27, 2014 by meena.p

1 answer

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

1 answer

Among O-nitro aniline(I),P-nitro aniline (II),M-nitro aniline (III) the order of increasing basic strength is

asked Feb 27, 2014 by sreemathi.v

1 answer

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

1 answer

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

1 answer

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

1 answer

The number of resonating structures of below 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

1 answer

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

asked Feb 27, 2014 by sreemathi.v

1 answer

In the following compounds the order of basicity is

asked Feb 27, 2014 by sreemathi.v

1 answer

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

asked Feb 27, 2014 by sreemathi.v

1 answer

In the below reaction,the reactive intermediate formed is

asked Feb 27, 2014 by sreemathi.v

1 answer

What would be the reagent in the below reaction

asked Feb 27, 2014 by sreemathi.v

1 answer

In the below reaction P is

asked Feb 27, 2014 by sreemathi.v

1 answer

What would be the major product on the following reaction?

asked Feb 27, 2014 by sreemathi.v

1 answer

Which of the following statement is correct?

asked Feb 27, 2014 by sreemathi.v

1 answer

A new carbon-carbon bond formation is possible in

asked Feb 27, 2014 by sreemathi.v

1 answer

What would be the product in the below reaction:

asked Feb 27, 2014 by sreemathi.v

1 answer

What could be the major product in the below reaction

asked Feb 27, 2014 by sreemathi.v

1 answer

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

0 answers

Phenol on exposure to air produces

asked Feb 27, 2014 by sreemathi.v

1 answer

In the following compounds

asked Feb 27, 2014 by sreemathi.v

1 answer

The below reaction is known as

asked Feb 27, 2014 by sreemathi.v

1 answer

The fries rearrangement of the below reaction ,the P is

asked Feb 27, 2014 by sreemathi.v

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 toMaximum enol content is observed in

asked Feb 27, 2014 by meena.p

1 answer

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

asked Feb 27, 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. 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

1 answer

Heat of neutralisation of HCl with $NH_4OH$ and NaOH with $CH_3COOH$ are respectively -51.4 and -50.6 kJ $eq^{-1}$. What will be the heat of neutralisation of acetic acid with $NH_4OH$?

asked Feb 26, 2014 by mosymeow_1

1 answer

If the heat of neutralisation for a strong acid-base reaction is -57.1 kJ what would be the heat released when 350 $cm^3$ of 0.20 M $H_2SO_4$ is mixed with 650 $cm^3$ of $0.10\; M\; NaOH$ ?

asked Feb 26, 2014 by mosymeow_1

1 answer

The stability of carbanions in the following :

asked Feb 26, 2014 by meena.p

1 answer

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

asked Feb 26, 2014 by meena.p

1 answer

If the bond dissociation energies of the diatomic molecules $XY, X_2$ and $Y_2$ are in the ratio of 1 : 1 : 0.5 and $\Delta_fH$ for the formation of XY is -200 kJ $mol^{-1}$. What is the bond dissociation energy of $X_2$ will be

asked Feb 26, 2014 by mosymeow_1

1 answer

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

asked Feb 26, 2014 by sreemathi.v

1 answer

The claisen rearrangement of the below reaction the product is

asked Feb 26, 2014 by sreemathi.v

1 answer

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

asked Feb 26, 2014 by meena.p

1 answer

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

asked Feb 26, 2014 by meena.p

1 answer

What would be the major product in the following reaction?

asked Feb 26, 2014 by sreemathi.v

1 answer

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