Recent questions in Chemistry

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

asked Feb 25, 2014 by meena.p

1 answer

In the below sequence of reaction X and Y are respectively

asked Feb 25, 2014 by sreemathi.v

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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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Propionic acid $\quad \underrightarrow{PCl_3}\quad X\quad\underrightarrow{C_6H_6}\quad Y$.In this sequence Y is

asked Feb 25, 2014 by sreemathi.v

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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 two cleavage reactions are given below :

asked Feb 25, 2014 by sreemathi.v

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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

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The below reaction with (i) $NH_3,H_2O$,(ii) acid HCl respectively give

asked Feb 25, 2014 by sreemathi.v

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

asked Feb 25, 2014 by sreemathi.v

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

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Which of the following is the major product of the reaction shown below

asked Feb 25, 2014 by sreemathi.v

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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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A metal M(at.wt = 40.0) depending on temperature crystallises in f.c.c and b.c.c structure whose unit cell length are 3.5 and $3.0 A^{\large\circ}$ respectively. The ratio of its densities in f.c.c and b.c.c structures is

asked Feb 25, 2014 by sharmaaparna1

1 answer

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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A unit cell of NaCl has four formula units. The edge length of unit cell is 0.564. The density of NaCl is

asked Feb 25, 2014 by sharmaaparna1

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A chiral $C_5H_{10}O$ ether reacts with hot $HI$ to give a $C_5H_{10}I_2$ product.Treatment of this with hot $KOH$ in ethanol produces $1$,$3$-pentadiene.What is the structure of the original ether?

asked Feb 25, 2014 by sreemathi.v

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At room temperature , Sodium crystallizes in a b.c.c lattice with edge length $a = 4.24A^{\large\circ}$ . Find the theoretical density of sodium.

asked Feb 25, 2014 by sharmaaparna1

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Which of the following is expected to have the lowest boiling point?

asked Feb 25, 2014 by sreemathi.v

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The density of KBr is 2.73g/cm. The length of the unit cell is 654pm. Find the number of atoms per unit cell in the cubic structure.

asked Feb 25, 2014 by sharmaaparna1

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Find the co-ordination number of sodium in $Na_2O$.

asked Feb 25, 2014 by sharmaaparna1

0 answers

Acid-catalysed reaction of oxirane is given below:

asked Feb 25, 2014 by sreemathi.v

1 answer

In CsCl with cubic structure $Cl^-$ ions are located at each corner and $Cs^+$ ions at the centre of the unit cell. If $r_{Cs^+}$ and $r_{Cl^-}$ are $1.69A^{\large\circ}$ and $1.81A^{\large\circ}$ respectively . Find the value of edge length of cube.

asked Feb 25, 2014 by sharmaaparna1

1 answer

In the below reaction product is/are

asked Feb 25, 2014 by sreemathi.v

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The formation of peroxide linkage in either due to the exposure in air can be detected by treating in with

asked Feb 25, 2014 by sreemathi.v

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What are the resulting products of the reaction below?

asked Feb 25, 2014 by sreemathi.v

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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

1 answer

What would be the product in the following reaction:

asked Feb 25, 2014 by sreemathi.v

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Tautomerism is exhibited by

asked Feb 25, 2014 by meena.p

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Which of the following reaction is the best choice for preparing Ethyl phenyl ether?

asked Feb 25, 2014 by sreemathi.v

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The following ether,when treated with HBr produces

asked Feb 25, 2014 by sreemathi.v

1 answer

Which of the following statement is correct?

asked Feb 25, 2014 by sreemathi.v

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Williamson ether systhesis for tert-butyl methyl ether is

asked Feb 25, 2014 by sreemathi.v

1 answer

The major product formed on the reaction given below :

asked Feb 25, 2014 by sreemathi.v

1 answer

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

1 answer

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

1 answer

Given $\Delta H^\circ _{ioniz}$ (HCN) = 45.2 kJ $mol^{-1}$ and $\Delta H^\circ _{ioniz} (CH_3COOH)$ = 2.1 kJ $mol^{-1}$. Which one of the following fact is true?

asked Feb 24, 2014 by mosymeow_1

1 answer

The heat evolved in combustion of benzene is given by the following equation: $C_6H_6 + \frac{15}{2} \rightarrow 3H_2O + 6CO_2$; $\Delta H= - 3264.6 kJ$ Which of the following quantities of heat will be evolved when 39 g of benzene are burnt in an open container?

asked Feb 24, 2014 by mosymeow_1

1 answer

The heat change for the following reaction at 298 K and constant pressure is +7.3 kcal. $A_2B(s) \rightarrow 2A(s) + \frac{1}{2} B_2(g)$; $\Delta H = + 7.3 kcal$ The heat change at constant volume would be

asked Feb 24, 2014 by mosymeow_1

1 answer

The enthalpy change at 298 K of the reaction $H_2O_2(l) \longrightarrow H_2O (l) + \frac{1}{2} O_2 (g)$ is -23.5 kcal $mol^{-1}$ and enthalpy of formation of $H_2O_2(l)$ is -44.8 kcal $mol^{-1}$. The enthalpy of formation of $H_2O(l)$ is

asked Feb 24, 2014 by mosymeow_1

1 answer

The work done on the system when one mole of an ideal gas at 500 K is compressed isothermally and reversibly to 1/10th of its original volume (R = 2 cal)

asked Feb 24, 2014 by mosymeow_1

1 answer

An ideal gas expands from $10^{-3} m^3$ to $10^{-2} m^3$ at 300 K, against a constant pressure of $10^5 N m^{-2}$. The work done on it is

asked Feb 24, 2014 by mosymeow_1

1 answer

For the reaction between $CO_2$ and graphite $CO_2(g) + C(s) \longrightarrow 2CO(g)$ $\Delta H = +170.0 kJ$ and $\Delta S = 170 JK^{-1}$. The reaction is spontaneous at

asked Feb 24, 2014 by mosymeow_1

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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

1 answer

An engine operating between $100^\circ C$ and $0^\circ C$ takes 453.6 Kcal of heat. How much useful work can be done by it?

asked Feb 24, 2014 by mosymeow_1

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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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What percent $T_1$ is of $T_2$ for a heat engine whose efficiency is 10%?

asked Feb 24, 2014 by mosymeow_1

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