Heating of 2 -chloro-1-phenylbutane with
Question: Heating of 2 -chloro-1-phenylbutane with EtOK/EtOH gives $\mathrm{X}$ as the major product. Reaction of $\mathrm{X}$ with $\mathrm{Hg}(\mathrm{OAc})_{2} / \mathrm{H}_{2} \mathrm{O}$ followed by $\mathrm{NaBH}_{4}$ gives $\mathrm{Y}$ as the major product. $Y$ is :Correct Option: , 4 Solution:...
Read More →The ratio of number of atoms present in a simple cubic,
Question: The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :$1: 2: 4$$8: 1: 6$$4: 2: 1$$4: 2: 3$Correct Option: 1 Solution:...
Read More →The temporary hardness of a water sample is due to compound X.
Question: The temporary hardness of a water sample is due to compound $X$. Boiling this sample converts $\mathrm{X}$ to compound $\mathrm{Y}$. $\mathrm{X}$ and $\mathrm{Y}$, respectively, are :$\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{CaO}$$\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{MgCO}_{3}$$\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{Mg}(\mathrm{OH})_{2}$$\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$ and $\mathrm{Ca}(\mathrm{OH})_{2}$Correct Op...
Read More →The C-C bond length is maximum in
Question: The $\mathrm{C}-\mathrm{C}$ bond length is maximum ingraphite$C_{70}$diamond$\mathrm{C}_{60}$Correct Option: , 3 Solution: In diamond $\mathrm{C}-\mathrm{C}$ bond have only $\sigma$ bond character while in case of graphite and fullerene $\left(\mathrm{C}_{60}\right.$ and $\left.\mathrm{C}_{70}\right) \mathrm{C}-\mathrm{C}$ bond contain double bond character. That's why diamond having maximum $\mathrm{C}-\mathrm{C}$ bond length....
Read More →Which of the given statements is INCORRECT
Question: Which of the given statements is INCORRECT about glycogen ?It is a straight chain polymer similar to amyloseOnly $\alpha$-linkages are present in the moleculeIt is present in animal cellsIt is present in some yeast and fungiCorrect Option: 1 Solution: Glycogen is an animal starch. It consists of $\alpha$-amylose and amylopectin. Amylopectin is branched chain polysaccharide Hence statement (1) is incorrect....
Read More →In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :
Question: In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :less efficient as it exchanges only anionsmore efficient as it can exchange only cationsless efficient as the resins cannot be regeneratedmore efficient as it can exchange both cations as well as anionsCorrect Option: , 4 Solution:...
Read More →25g of an unkown hydrocarban upon burning produces
Question: $25 \mathrm{~g}$ of an unknown hydrocarbon upon burning produces $88 \mathrm{~g}$ of $\mathrm{CO}_{2}$ and $9 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$. This unknown hydrocarbon contains.$20 \mathrm{~g}$ of carbon and $5 \mathrm{~g}$ of hydrogen$24 \mathrm{~g}$ of carbon and $1 \mathrm{~g}$ of hydrogen$18 \mathrm{~g}$ of carbon and $7 \mathrm{~g}$ of hydrogen$22 \mathrm{~g}$ of carbon and $3 \mathrm{~g}$ of hydrogenCorrect Option: , 2 Solution:...
Read More →Given that the standard potentials
Question: Given that the standard potentials $\left(\mathrm{E}^{\circ}\right)$ of $\mathrm{Cu}^{2+} / \mathrm{Cu}$ and $\mathrm{Cu}^{+} / \mathrm{Cu}$ are $0.34 \mathrm{~V}$ and $0.522 \mathrm{~V}$ respectively, the $\mathrm{E}^{\circ}$ of $\mathrm{Cu}^{2+} / \mathrm{Cu}^{+}$is :$+0.158 \mathrm{~V}$$0.182 \mathrm{~V}$$-0.182 \mathrm{~V}$$-0.158 \mathrm{~V}$Correct Option: 1 Solution:...
Read More →Thermal decomposition of a Mn compound
Question: Thermal decomposition of a Mn compound (X) at $513 \mathrm{~K}$ results in compound $\mathrm{Y}, \mathrm{MnO}_{2}$ and a gaseous product. $\mathrm{MnO}_{2}$ reacts with $\mathrm{NaCl}$ and concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ to give a pungent gas $\mathrm{Z}$. $X, Y$ and Z, respectively.$\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{KMnO}_{4}$ and $\mathrm{SO}_{2}$$\mathrm{K}_{2} \mathrm{MnO}_{4}, \mathrm{KMnO}_{4}$ and $\mathrm{Cl}_{2}$$\mathrm{K}_{3} \mathrm{MnO}_{4}, \mathrm{~K...
Read More →NO2 required for a reaction is produced by
Question: $\mathrm{NO}_{2}$ required for a reaction is produced by the decomposition of $\mathrm{N}_{2} \mathrm{O}_{5}$ in $\mathrm{CCl}_{4}$ as per the equation $2 \mathrm{~N}_{2} \mathrm{O}_{5}(\mathrm{~g}) \rightarrow 4 \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})$ The initial concentration of $\mathrm{N}_{2} \mathrm{O}_{5}$ is $3.00 \mathrm{~mol} \mathrm{~L}^{-1}$ and it is $2.75 \mathrm{~mol} \mathrm{~L}^{-1}$ after 30 minutes. The rate of formation of $\mathrm{NO}_{2}$ is :$2.0...
Read More →Solve this following
Question: The dipole moments of $\mathrm{CCl}_{4}, \mathrm{CHCl}_{3}$ and $\mathrm{CH}_{4}$ are in the order :$\mathrm{CH}_{4}=\mathrm{CCl}_{4}\mathrm{CHCl}_{3}$$\mathrm{CH}_{4}\mathrm{CCl}_{4}\mathrm{CHCl}_{3}$$\mathrm{CCl}_{4}\mathrm{CH}_{4}\mathrm{CHCl}_{3}$$\mathrm{CHCl}_{3}\mathrm{CH}_{4}=\mathrm{CCl}_{4}$Correct Option: 1 Solution:...
Read More →Solve this following
Question: The atomic radius of $\mathrm{Ag}$ is closest to :$\mathrm{Cu}$$\mathrm{Hg}$$\mathrm{Au}$$\mathrm{Ni}$Correct Option: , 3 Solution: Atomic radius of $\mathrm{Ag}$ and $\mathrm{Au}$ is nearly same due to lanthanide contraction....
Read More →In the following skew conformation of ethane,
Question: In the following skew conformation of ethane, $\mathrm{H}^{\prime}-\mathrm{C}-\mathrm{C}-\mathrm{H}^{\prime \prime}$ dihedral angle is : $120^{\circ}$$58^{\circ}$$149^{\circ}$$151^{\circ}$Correct Option: , 3 Solution:...
Read More →Solve this following
Question: The increasing order of $\mathrm{pK}_{\mathrm{b}}$ for the following compounds will be : $(\mathrm{A})(\mathrm{B})(\mathrm{C})$$(C)(A)(B)$$(\mathrm{B})(\mathrm{A})(\mathrm{C})$$(\mathrm{B})(\mathrm{C})(\mathrm{A})$Correct Option: , 3 Solution: Base strength order...
Read More →In comparison to boron, berylium has :
Question: In comparison to boron, berylium has :lesser nuclear charge and greater first ionisation enthalpylesser nuclear charge and lesser first ionisation enthalpygreater nuclear charge and greater first ionisation enthalpygreater nuclear charge and lesser first ionisation enthalpyCorrect Option: 1 Solution: In case of 'Be' electron remove from '2s' orbital while in case of 'B' electron remove from ' $2 p^{\prime}$ orbital. ' $2 s^{\prime}$ orbital have greater penetration effect then '2p' orb...
Read More →Among the following,
Question: Among the following, the INCORRECT statement about colloids is :They can scatter lightThey are larger than small molecules and have high molar massThe range of diameters of colloidal particles is between 1 and $1000 \mathrm{~nm}$The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentrationCorrect Option: , 4 Solution: Colligative properties of colloidal solution are smaller than true solution...
Read More →What is the product of following reaction?
Question: What is the product of following reaction? Correct Option: , 3 Solution:...
Read More →The IUPAC name of the following compound is :
Question: The IUPAC name of the following compound is : 3,5 -dimethyl-4-propylhept-6-en-1-yne3 -methyl-4-(3-methylprop-1 -enyl)-1 heptyne3 -methyl-4-(1-methylprop-2-ynyl)-1 heptene3,5 -dimethyl-4-propylhept-1 -en-6-yneCorrect Option: , 4 Solution: 3,5 -Dimethyl-4-propylhept-1-en-6-yne Longest carbon chain, including multiple bonds, and numbering starts from double bond....
Read More →Amongst the following statements, that which was not proposed by Dalton was :
Question: Amongst the following statements, that which was not proposed by Dalton was :all the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass.chemical reactions involve reorganisation of atoms. These are neither created nor destroyed in a chemical reaction.when gases combine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same $\mathrm{T} \ \mathrm{P}$.matter consist...
Read More →Solve this following
Question: 1-methyl ethylene oxide when treated with an excess of HBr produces :Correct Option: , 4 Solution:...
Read More →An ' Assertion' and a 'Reason' are given below.
Question: An ' Assertion' and a 'Reason' are given below. Choose the correct answer from the following options. Assertion (A) : Vinyl halides do not undergo nucleophilic substitution easily. Reason (R) : Even though the intermediate carbocation is stabilized by loosely held $\pi$-electrons, the cleavage is difficult becuase of strong bonding.Both (A) and (R) are wrong statementsBoth (A) and (R) are correct statements and (R) is the correct explanation of (A)Both (A) and (R) are correct statement...
Read More →A solution of m-chloroaniline,
Question: A solution of m-chloroaniline, $m$-chlorophenol and $\mathrm{m}$-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of $\mathrm{NaHCO}_{3}$ to give fraction A. The left over organic phase was extracted with dilute $\mathrm{NaOH}$ solution to give fraction B. The final organic layer was labelled as fraction C. Fractions A, B and C, contain respectively :m-chlorobenzoic acid, m-chloroaniline and $\mathrm{m}$-chlorophenolm-chloroaniline, m-chlorobenzoic ...
Read More →The primary pollutant that leads to
Question: The primary pollutant that leads to photochemical smog is:sulphur dioxideacroleinozonenitrogen oxidesCorrect Option: , 4 Solution: Nitrogen oxides and hydrocarbons (unburnt fuel) are primary pollutant that leads to photochemical smog....
Read More →Among the following,
Question: Among the following, the energy of $2 \mathrm{~s}$ orbital is lowest in :$\mathrm{K}$$\mathrm{Na}$$\mathrm{Li}$$\mathrm{H}$Correct Option: 1 Solution: In 'K', 2s orbital feel maximum attraction from nucleus (So having less energy) due to more $\mathrm{Z}_{\text {eff }}$....
Read More →The correct name of the following polymer is:
Question: The correct name of the following polymer is: PolyisoprenePolytert-butylenePolyisobutanePolyisobutyleneCorrect Option: , 4 Solution:...
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