Recent questions in Chemistry

In this sequence Z is

asked Mar 21, 2014 by thanvigandhi_1

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Which of the following is least alkaline?

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Which of the following cannot couple with benzene diazonium chloride?

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The reagent used in Hoffmann’s mustard oil reaction is

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Which of the following will not give primary amine?

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Aniline was diazotized and was subsequetly reduced with tin (11)chloride and Hcl.the product formed is

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The reaction of Aniline with benzoyl chloride gives

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Which of the following pairs of species will yield carbylamine?

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Which of the following when heated with a mixture of ethanamine and alcoholic potash gives ethyl isocynide?

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Which of the following amines can exhibit enantiomerism?

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Number of atoms in 558.5 g Fe (at.wt of Fe=$55.85gmol^{-1})$ is

asked Mar 21, 2014 by sreemathi.v

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Oxidation of aniline with $k_2Cr_2O_7/H_2SO_4$ gives

asked Mar 21, 2014 by thanvigandhi_1

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In the below reaction $Z$ is

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From 392mg of $H_2SO_4,1.204\times 10^{21}$ molecules are removed.How many moles of $H_2SO_4$ are left?

asked Mar 21, 2014 by sreemathi.v

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Which of the following does not react with Hinsberg reagent?

asked Mar 21, 2014 by thanvigandhi_1

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Which of the statements about the two structures are correct?

asked Mar 21, 2014 by thanvigandhi_1

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There are as many notes as number of oxygen atoms in 24.8g $Na_2S_2O_3.5H_2O$ (molecular weight =$248gmol^{-1})$.A note-counting machine counts 48 million notes per day.Days taken to count these notes are

asked Mar 21, 2014 by sreemathi.v

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Basic hydrolysis of alkyl cyanide produces

asked Mar 21, 2014 by thanvigandhi_1

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Which of the following is an ambident nucleophile ?

asked Mar 21, 2014 by thanvigandhi_1

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Which of the following on dehydration with $P_2O_5$ gives ethanenitrile?

asked Mar 21, 2014 by thanvigandhi_1

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The atomic weight of Cu is 63.546.There are only two naturally occuring isotopes of copper,$^{63}Cu$ and $^{65}Cu$.The relative abundance of the $^{63}Cu$ isotope must be

asked Mar 21, 2014 by sreemathi.v

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Reaction of $R-CO-NH_2$ with a mixture of $Br_2$ and $KOH$ gives $R-NH_2$ as main product .The intermediate involved in the reaction are \[\] 1. $R-CO-NHBr$ \[\] 11 . $R-N =C=O$ \[\] 111. $R-NH-Br$ \[\] 1v. $H-CO-NBr_2$

asked Mar 21, 2014 by thanvigandhi_1

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$2H_2+O_2\rightarrow 2H_2O$.2g $H_2$ and 1g $O_2$ react to form $H_2O$

asked Mar 21, 2014 by sreemathi.v

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The equivalent mass of chlorine is 35.5 and the molar mass of copper is 63.5.The equivalent mass of copper chloride is 99.0.Hence formula of copper chloride is

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Which one of the following amines does not undergo acylation?

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The equivalent weight of an element is 4.Its chloride has a vapour density 59.25.Then the valency of the element is

asked Mar 21, 2014 by sreemathi.v

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Marsh gas mainly contains

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Acidic hydrogen is present in

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The chief reaction product of reaction between n-butane and bromine at $130^{\large\circ}$ is

asked Mar 21, 2014 by sreemathi.v

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Propyne and propene can be distinguished by

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$(CH_3)_3CMgCl$ on reaction with $D_2O$ produces

asked Mar 21, 2014 by sreemathi.v

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The reaction , $3Cl_O(aq) \longrightarrow ClO_{3(ag)}^{-}+2 Cl^{-}_ {(aq)}$ is an example of

asked Mar 21, 2014 by meena.p

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During debromination of meso-dibromobutane,the major compound formed is

asked Mar 21, 2014 by sreemathi.v

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The number of neutrons in dipositive zinc ion with mass number 70 is

asked Mar 21, 2014 by meena.p

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The highest boiling point is expected for

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Consider the following reaction:Identify the structure of the major product X

asked Mar 21, 2014 by sreemathi.v

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Benzyl chloride $(C_6H_5CH_2Cl)$ can be prepared from toluene by chlorination with

asked Mar 21, 2014 by sreemathi.v

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$\begin{array}{1 1}\text{Statement-1:Addition of bromine to trans-2-butene yields meso 2,3-dibromobutane.}\\\text{Statement-2:Bromine addition to an alkene is an electrophilic addition}\end{array}$

asked Mar 21, 2014 by sreemathi.v

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If $0.50$ mol of $Bacl_2$ is mixed with $0.20$ mol of $Na_3PO_4$ , the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is

asked Mar 21, 2014 by meena.p

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A gaseous mixture contains oxygen and nitrogen in the ratio of $1:4$ by weight . Therefore , the ratio of their number of molecules is

asked Mar 21, 2014 by meena.p

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1-Butyne on oxidation with hot alkaline $KMnO_4$ would yield

asked Mar 21, 2014 by sreemathi.v

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In the standardization of $Nas_2S_2O_3$ using $K_2Cr_2O_7$ by iodometry , the equivalent weight of $K_2Cr_2O_7$ is

asked Mar 21, 2014 by meena.p

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$B\quad\underrightarrow{\text{Lindlar catalyst}/H_2}\quad R-C\equiv C-R\quad\underrightarrow{Na/NH_3}\quad A.$ A and B are geometrical isomers $(R-CH=CH-R)$

asked Mar 21, 2014 by sreemathi.v

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10ml of gaseous hydrocarbon requires 30ml of oxygen for complete combustion.The hydrocarbon is

asked Mar 21, 2014 by sreemathi.v

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From the following reactions,predict which of the following orders regarding acid strength is correct? \[\begin{array}{1 1}HC\equiv CH+LiNH_2\quad\leftrightharpoons\quad NH_3+HC\equiv CLi\\NH_3+R^-\quad\leftrightharpoons \quad NH_2^-+RH\end{array}\]

asked Mar 21, 2014 by sreemathi.v

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The alkene $C_6H_{10}$ producing $OHC(CH_2)_4CHO$ on ozonolysis is

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Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

asked Mar 21, 2014 by meena.p

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$CH_3CH=CHCH_3+CH_2N_2\rightarrow A$. A is

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When $CH_3CH_2CHCl_2$ is treated with $NaNH_2$,the product formed is

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How many moles of electron weight one kilogram ?

asked Mar 21, 2014 by meena.p

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