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In the following, two statement are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these question from the codes (i), (ii), (iii) and (iv) as given below :

Assertion (A) : Low spin tetrahedral complexes are rarely observed.

Reason (R) : The orbital splitting energies are not sufficiently large to force pairing.

Option: 1

Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Option: 2

Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Option: 3

Assertion (A) is correct, but Reason (R) is an incorrect statement.


Option: 4

Assertion (A) is incorrect, but Reason (R) is a correct statement.


As we have learnt, 

Tetrahedral splitting is usually small and as a result, the process of pairing requires more energy as opposed to electron occupying the higher energy level in the tetrahedral field.

Hence, spin pairing is not seen and as a result, low spin tetrahedral complexes are seldom seen.

Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).

Hence, the correct answer is Option (1)

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Posted by

vinayak

Two statements are given in the following question one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below :

Assertion (A) : \mathrm{\left[P t(e n)_{2} Cl _{2}\right]^{2+}}complex is less stable than \mathrm{\left[ Pt \left( NH _{3}\right)_{4} C l_{2}\right]^{2+}} complex.

Reason (R) : \mathrm{\left[P t(e n)_{2} Cl _{2}\right]^{2+}}complex shows chelate effect.

Option: 1

Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Option: 2

Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Option: 3

Assertion (A) is correct, but Reason (R) is incorrect statement.


Option: 4

Assertion (A) is incorrect, but Reason (R) is correct statement.


As we have learnt, 

\mathrm{\left[P t(e n)_{2} Cl _{2}\right]^{2+}}contains bidentate ligand, \mathrm{en} (ethylene diamine) which is capable of showing chelation while \mathrm{\left[P t(NH_3)_{4} Cl _{2}\right]^{2+}} does not show chelation as it contains all monodentate ligands.

Thus, \mathrm{\left[P t(e n)_{2} Cl _{2}\right]^{2+}}is more stable than \mathrm{\left[P t(NH_3)_{4} Cl _{2}\right]^{2+}} and hence, Assertion (A) is incorrect while Reason (R) is correct.

Hence, the correct answer is Option (4)

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Posted by

Divya Prakash Singh

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The crystal field splitting energy for octahedral (\Delta _{0}) and tetrahedral (\Delta _{t}) complexes is related as

Option: 1

\mathrm{\Delta_{t}=\frac{2}{9} \Delta_{0}}


Option: 2

\mathrm{\Delta_{t}=\frac{5}{9} \Delta_{0}}


Option: 3

\mathrm{\Delta_{t}=\frac{4}{9} \Delta_{0}}


Option: 4

\mathrm{\Delta_{t}=2 \Delta_{0}}


The crystal field splitting energy for octahedral (\Delta _{0}) and tetrahedral (\Delta _{t}) complexes is related as 

\mathrm{\Delta _{_{t}}=\frac{4}{9}\; \Delta _{0}}

This is because of the following reasons:

(1) Number of ligands in a tetrahedra complex is 4 whereas that in an octahedral complex is 6. This accounts for a factor of \frac{2}{3} roughly

(2) No ligands directly approach the d- orbitals of the metals in a Tetrahedral field whereas in an Octahedral field, the \mathrm{e_g} orbitals \mathrm{(d_{x^2-y^2}\ and\ d_{z^2})} directly face the incoming ligands which roughly accounts for another factor of  \frac{2}{3}.

Hence, the correct answer is Option (3)

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Posted by

chirag

Read the given passage and answer the question  : Organic compounds containing amine as functional group are present in a vivid variety of compounds, namely amino acids, hormones, neurotransmitters, DNA, alkaloids, dyes, etc. Drugs including nicotine, morphine, codeine and heroin, etc. which have physiological effects on humans also contain amino group in one form or another. Amines are basic because of the presence of lone pair of electrons on nitrogen. Addition of nitrogen into an organic framework leads to the formation of two families of molecules, namely amines and amides. As chemistry students, we must appreciate the versatility of nitrogen. Give one point of difference between acidic and basic amino acid.
 

Acidic amino acids- They have more number of carboxyl groups than amino groups. whereas

Basic amino acids- have more number of amino groups than carboxyl groups.

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Posted by

Safeer PP

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Iodoform test is given by 
Option: 1 Pentan-2-one
Option: 2 Ethanoic acid
Option: 3 Pentan-3-one
Option: 4 Methoxymethane

Ask questions answer she saw a tiger

 

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Posted by

Diganta Bora

Read the given passage and answer the questions that follow : The substitution reaction of alkyl halide mainly occurs by S_{N}1 or S_{N}2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon halogen bond is responsible for these substitution reactions. The rate of S_{N}1reactions are governed by the stability of carbocation whereas for S_{N}2 reactions steric factor is the deciding factor. If the starting material is a chiral compound, we may end up with an inverted product or racemic mixture depending upon the type of mechanism followed by alkyl halide. Cleavage of ethers with HI is also governed by steric factor and stability of carbocation, which indicates that in organic chemistry, these two major factors help us in deciding the kind of product formed. Write the structures of the products formed when ethoxybenzene is treated with HI.

Products formed when ethoxybenzene is treated with HI are

C2H5I + C6H5OH

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Posted by

Safeer PP

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Iodoform test is not given by 
Option: 1 Hexan-2-one
Option: 2 Hexan-3-one 
Option: 3 Ethanol 
Option: 4 Ethanal

 Iodoform test is not given by Hexan-3-one, since it is not methyl ketone 

Hence option B is correct 

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Posted by

Safeer PP

(a) Give the mechanism for the formation of ethanol from ethene.  (b) Predict the reagent for carrying out the following conversions :     (i) Phenol to benzoquinone     (ii) Anisole to p-bromoanisole     (iii) Phenol to 2,4,6-tribromophenol
 

(a) Mechanism for the formation of ethanol from ethene- 

 (b) Reagent for carrying out the following conversions :

    (i) Phenol to benzoquinone

  •    K2Cr2O7 + H2SO4

    (ii) Anisole to p-bromoanisole

  •  Br2 in CH3COOH

    (iii) Phenol to 2,4,6-tribromophenol

  •  Br2 aq. / Bromine water

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Posted by

Safeer PP

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Asseration and Reasoning question: (i) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A). (ii) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). (iii) Assertion (A) is correct, but Reason (R) is incorrect statement. (iv) Assertion (A) is incorrect, but Reason (R) is correct statement. Assertion (A) : The molecularity of the reaction H_{2} + Br_{2} \rightarrow 2HBr appears to be 2. Reason (R) : Two molecules of the reactants are involved in the given elementary reaction.
 

Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).

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Safeer PP

Asseration and Reasoning qustion: (i) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A). (ii) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A). (iii) Assertion (A) is correct, but Reason (R) is incorrect statement. (iv) Assertion (A) is incorrect, but Reason (R) is correct statement. Assertion (A) : Sucrose is a non-reducing sugar. Reason (R) : Sucrose has glycosidic linkage.
 

(ii) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).

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Posted by

Safeer PP

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