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What is ziggler natta catalyst and its structure?

Posted by Satyam Maurya 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaytri Devi 6 years, 11 months ago

It is a catalyst used in polymerization of ethene to form high density polythene. (C2H5)3Ag+TiCl4

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What is beckmann rearrangement? Explain with example

Posted by V. Sundresh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 11 months ago

The Beckmann Rearrangement is a reaction of the oximes that can bring about either nitriles or amides, contingent upon the beginning material. These Oximes that obtained from the ketones develop into amides; oximes got from the aldehydes shape into nitriles.

The Beckmann Rearrangement process is a natural reaction that is useful in changing an oxime to that of an amide under some acidic conditions. The reaction eventually starts by the process of protonation of the alcohol group gather shaping a preferred leaving group.

The R group transition to that of the leaving species then moves to the nitrogen, bringing about a carbocation and the arrival of a water particle. The water atom attacks the carbocation, and after the process of deprotonation and tautomerization, the amide is obtained.

In simple, Beckmann Rearrangement is a reaction where oxime is changed over to an amide. The oxime is processed by treating an aldehyde or a ketone with hydroxylamine. This Beckmann Rearrangement reaction, named after Ernst Otto Beckmann, a German scientist.

Mechanism:

The process of Beckmann Rearrangement is as shown below-

The oxime is shaped when cyclohexanone responds with the hydroxylamine.

The Protonation of hydroxyl of oxime happens after the change of the alkyl substituent “trans” to the nitrogen

At the same time, the N-O bond is severed with the expulsion of water.

Later, Isomerization process happens which protonates the molecule of nitrogen and then prompts to the production of amine.

Applications:

Some of the uses of this reaction are as below-

It is used in the industries for the synthesis of paracetamol. This integration is achieved by the process of conversion of a ketone to ketoxime with the help of hydroxylamine.

It is mainly used in the synthesis of various steroids and drugs

The Beckmann Rearrangement synthesis is helpful in the production of some of the chloro bicyclic lactams.

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Write short note on EMF diagrams

Posted by Adara Girl 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Convert propanoic acid to ethene

Posted by Deepak Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Mechanisms of aldol condensation

Posted by Kshitij Bajpai 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

The mechanism of aldol condensation initiates with the formation of carbanion intermediate. Refer to the steps below to observe the mechanism of aldol condensation in the presence of a base as a catalyst.

Aldol Condensation in Aldehydes with Base as a Catalyst

Step 1: Removal of α-hydrogen from the base
Step 2: The first step results in the formation of carbanion which undergoes a nucleophilic addition reaction with the carbonyl group present in the second molecule of the aldehyde (in this case ethanal). The second step results in the formation of the condensation product.
Step 3: Protonation of alkoxide ion will occur due to reaction with water.
Step 4: Heating of the aldol compound in the basic solution will help in dehydrating the product to form α β‐unsaturated aldehyde compound.

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Many of transition elements are known to form interstitial compounds why

Posted by Rajleena Abdulazeez 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Akanksha Singh 6 years, 11 months ago

Since the transition elements are large sized there voids are also big Therefore other smaller atoms get embedded inside these voids Thus transition elements are known to form interstitial compounds

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What is the significance of MENDIUS reaction??

Posted by Yagyesh Dubey 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Advantage of Molality Over Molarity????

Posted by Mohammad Kaif 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Shobhit Singh 6 years, 11 months ago

since molality is no. of moles of solvent over total mass in kg therefore it gives accurate answer comparable to molarity. Thank you

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Sakshi Singh 6 years, 11 months ago

Molality can't change with change in tempreture while molarity changes.

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Adsorption defination

Posted by Bidisha Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Sagar Saini 6 years, 11 months ago

It is the phenomina by which adsorbate is adsorbed on the surface of adsorbent

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Tduene into p-amino toluene

Posted by Anas Ali 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Uday Pratap 6 years, 11 months ago

Toluene react with conc. HNO3 +conc.H2SO4 form CH3C6H4NO2 which further react with Sn/HCl gives product i.e. p-aminotoluene. Thank you

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Which is better reducing agent between carbon and co

Posted by Uma Jadon 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Uma Jadon 6 years, 11 months ago

Carbon monoxide

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Sakshi Singh 6 years, 11 months ago

It depends on the situation.

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Uma Jadon 6 years, 11 months ago

Carbo monoxide

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what is pusside test ?

Posted by Ravi Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Conversion ethyne to but-1-yne

Posted by Mona Manka 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Uday Pratap 6 years, 11 months ago

First ethyne converted into ethane. Then ethane react with chlorine in the presence of sun light, gives ethane chloride. Thab ethane chloride react with sodium acitylide i.e.NaC=_CH which gives butyne with NaCl.

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Show important questions related to colloidal mill

Posted by Yuvaraj Singh Thakur 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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P nitro phenol is more acific than p methyl phenol

Posted by Lalit Rajpoot 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaytri Devi 6 years, 11 months ago

No2 shows minus I effect because of this it withdrawal charge from benzene ring and act as strong acid but CH3 is a plus I effect showing group it donate charge to the benzene ring and become it positively charged so it is less acidic.

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What is the trend followed by Group 18 elements regarding Metallic character?

Posted by Anshal Tomar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Five Advantages if fuel cell

Posted by Kunika Gupta 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Rohit Kumar 6 years, 11 months ago

Reduced green house emissions ELiminate pollution by burning fossil fuels It operates silently

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Rohit Kumar 6 years, 11 months ago

Effecient

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Structure of dibasic oxophosphorus acid

Posted by Aman Saini 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

H!Mαη$Hμ Ұαδαυ ✔️ 6 years, 11 months ago

https://goo.gl/images/kweHUv

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Ni is weak filled ligand or strong filled ligand

Posted by Shaurya Roy 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

H!Mαη$Hμ Ұαδαυ ✔️ 6 years, 11 months ago

Ni is not a ligand it is central metal atom (may be ion)..

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Musturd oil reaction

Posted by Manmeet Virdi 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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What is roasting

Posted by Renu Bala 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Robins Kumar Dinkar 6 years, 11 months ago

Roasting is atype of process in which sulphide ore is heated at high temp. (below melting point) to for corresponding oxides.

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Kapil Dalal 6 years, 11 months ago

Roasting is a process in metallurgy in which a sulphide ore is heated in air.

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A solution of glucose in water is labelled as 10% by weight what would be the molality of the solution

Posted by Shamuill Antri 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Vapour pressure of water at 20 degree Celsius is 17.5 mm of mercury calculate the vapour pressure of water 20 degree Celsius when 15 g of glucose is dissilved in 150 g of water

Posted by Satnam Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Where can I get viva voce qeations from?

Posted by Akshay Kumar Mishra 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Why sulphide ore is conc. by froath floatation method

Posted by Muhammad Saif 6 years, 11 months ago

CBSE > Class 12 > Chemistry

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Define dual nature of mater and radiation ..?

Posted by Prabhat Yadav. Vikash 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Robins Kumar Dinkar 6 years, 11 months ago

Phenomena like diffraction ,polymerisation shows wave nature of light while photoelectric effect and compton effect shows particle nature of light .As a whole there is exitence of dual nature of light depending upon the situation.

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radioactive & gaseous element in periodic table

Posted by Shanaya Jain 6 years, 11 months ago

CBSE > Class 12 > Chemistry