Recent questions in Chemistry

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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$N_2 + 3H_2 \longrightarrow 2NH_3$ This reaction is carried out at constant temperature and pressure. If $\Delta H$ and $\Delta U$ are enthalpy and internal energy change for the reaction, which of the following expression is true?

asked Feb 26, 2014 by mosymeow_1

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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?

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Toutomerism is not exhibited by

asked Feb 26, 2014 by meena.p

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For a spontaneous reaction, the $\Delta G$, equilibrium constant, K and $E^\circ _{cell}$ will be respectively

asked Feb 26, 2014 by mosymeow_1

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Which of the following statements is correct?

asked Feb 26, 2014 by sreemathi.v

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$MgO(s) + 2HCl(aq) \longrightarrow MgCl_2(aq) + H_2O(l)$; The absolute enthalpy of neutralisation of the reaction is

asked Feb 26, 2014 by mosymeow_1

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The major product obtained on heating $\gamma$-hydroxy acid $CH_3-CH_2-CHOH-CH_2-CH_2-COOH$ is

asked Feb 26, 2014 by sreemathi.v

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How much heat would release when an aqueous solution containing 0.5 mol of $HNO_3$ is mixed with 0.3 mol of $OH^{-1}$? Given, enthalpy of neutralisation is -57.1 kJ.

asked Feb 26, 2014 by mosymeow_1

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At 1 atm pressure, for a reaction $\Delta H = + 30.558$ kJ $mol^{-1}$ and $\Delta S = 0.066$ kJ $mol^{-1}$. The temperature at which free energy is equal to zero and the nature of the reaction below this temperature are

asked Feb 26, 2014 by mosymeow_1

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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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Study the following table and, on the basis of these values of $\Delta H$ and $\Delta S$ for five different reactions, predict which one of these will be spontaneous at all temperatures?

asked Feb 26, 2014 by mosymeow_1

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In the below sequence X and Y are

asked Feb 26, 2014 by sreemathi.v

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A cylinder of gas is assumed to contain 14 kg of butane. A normal family requires 20,000 kJ of energy per day for cooking. How many days will the butane gas in the cylinder last?

asked Feb 26, 2014 by mosymeow_1

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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 compound observed in the mechanism of Beckmann rearrangement of the below

asked Feb 26, 2014 by sreemathi.v

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What is the change in entropy of 1 mole of a perfect gas, which expands isothermally to ten times its original volume?

asked Feb 26, 2014 by mosymeow_1

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The correct acid strength order of the compounds

asked Feb 26, 2014 by sreemathi.v

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The treatment of $LiAlH_4$ with the below one leads to

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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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The heat liberated when 50 $cm^3$ of 0.2 N $H_2SO_4$ is mixed with 50 $cm^3$ of 1 N KOH, is

asked Feb 25, 2014 by mosymeow_1

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Show the relation between the enthalpies of the reactions: $H_2(g)+ \frac{1}{2} O_2(g) \rightarrow H_2O(g); \Delta H_1$ and $H_2(g)+\frac{1}{2}O_2(g) \rightarrow H_2O(l); \Delta H_2$

asked Feb 25, 2014 by mosymeow_1

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What is the standard Gibbs energy change for the reaction at 298 K, if standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are 382.64 kJ $mol^{-1}$ and -145.6 $JK^{-1}mol^{-1}$, respectively.

asked Feb 25, 2014 by mosymeow_1

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How much heat is liberated when 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl ?

asked Feb 25, 2014 by mosymeow_1

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Keeping in mind the enthalpy of formation of HF and HCl i.e. -161 kJ and -92 kJ, respectively, which of the following statements do you think is incorrect?

asked Feb 25, 2014 by mosymeow_1

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The molar heat capacity of water at constant pressure, $C_P$ is $75JK^{-1}mol^{-1}$. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is

asked Feb 25, 2014 by mosymeow_1

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Heat of combustion $\Delta H$ for $C(s), H_2(g)$ and $CH_4(g)$ are -94, -68 and -213 kcal/mol. Then $\Delta H$ for $C(s) + H_2(g) \rightarrow CH_4(g)$ is

asked Feb 25, 2014 by mosymeow_1

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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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Which of the following condition depicts a favourable condition for a spontaneous reaction?

asked Feb 25, 2014 by mosymeow_1

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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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Assume the enthalpy of combustion of methane and $CH_3OH$ are $x$ and $y$ respectively. If the enthalpy of $CH_4 + \frac{1}{2}O_2 \rightarrow CH_3OH$ is negative, then which relation is correct?

asked Feb 25, 2014 by mosymeow_1

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Given three reaction below, $N_2(g) + 3H_2(g) \leftrightharpoons 2NH_3(g); \Delta H_1$, $H_1(g) + Cl_2(g) \leftrightharpoons 2HCl(g) ; \Delta H_2$, $NH_3 (g) + 3Cl_2 \leftrightharpoons NCl_3(g) + 3HCl(g); -\Delta H_3$. In the terms of $\Delta H_1, \Delta H_2$ and $\Delta H_3$, heat of formation of $NCl_3(g)$ is

asked Feb 25, 2014 by mosymeow_1

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The following table lists the bond dissociation energy ($E_{diss}$) for single covalent bonds formed between C and atoms A, B, D, E. Which of the atoms has smallest size?

asked Feb 25, 2014 by mosymeow_1

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What is the work done when 1 mol of water at 373 K vapourises against atmospheric pressure of 1.0 atmosphere? [Solve the question assuming ideal gas behaviour]

asked Feb 25, 2014 by mosymeow_1

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Which carboxylic acid will show HVZ reaction?

asked Feb 25, 2014 by sreemathi.v

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