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ANSWER

Why does primary aliphatic amines form highly unstable alkyl diazonium salts?

Posted by Sunandan Sharma 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

The diazonium salt of aromatic amines undergoes resonance as shown below:

This resonance accounts for the stability of the Arenediazonium salts (or diazonium salts of aromatic amine). On the other hand, no such resonance is possible for diazonium salts of alipahitic amines. Hence, diazonium salts of aromatic amines are more stable than those of aliphatic amines.

ANSWER

Which of the following is a dissachride? Starch, maltose , fructose, glucose

Posted by Yashi Khera 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Kk Jangid 6 years, 11 months ago

maltose

Gaurav Seth 6 years, 11 months ago

Maltose is a disaccharide consisting of two monomer units of alpha-D-glucose linked via C1-C4 linkage.

ANSWER

Write the vitamin responsible for coagulation of blood?

Posted by Sunita Tiwari 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Kk Jangid 6 years, 11 months ago

table 14.3 from ncert ch biomolecule

Yashi Khera 6 years, 11 months ago

Vitamin k

ANSWER

How is brownian movement is responsible for stability of sols.

Posted by Shiv Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 11 months ago

Brownian movement: The irregular and random motion by the particles suspended in a fluid is referred to as Brownian movement.

The particles move continuously without stopping.

It is caused by the water molecules colliding with the molecules of the colloidal particles.

During Brownian motion, a stirring effect is produced. This effect does not let the particles to settle down.

Hence, it affects the stability of the sol by not allowing the sol particles to settle down.

ANSWER

What is iupac name of CH2=C-CH2-CH2-OH | COOH

Posted by Rahul Kumar Choudhary 5 years, 8 months ago

CBSE > Class 12 > Chemistry

1 answers

Shaima Ameen 6 years, 11 months ago

2 hydroxy 4 ene pentoic acid

ANSWER

how to check out the basicity orders for several amines??

Posted by Pallu Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

how to do conversions in organic chemistry?? is there any trick or key points??

Posted by Pallu Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Ashish Nehra 6 years, 11 months ago

No trick

Nitika Neb 6 years, 11 months ago

You have to practice them again and again

ANSWER

How to study chemistery

Posted by Bharat K 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Nitika Neb 6 years, 11 months ago

Do ten year paper and ncert back exercise

Yo Yo Honey Singh ? 6 years, 11 months ago

COMPREHENSIVE CHEMISTRY

Kalas Sahu 6 years, 11 months ago

Read from ncert

5Thank You

ANSWER

Which of the following is attracted towards nucleophilic substitution of hydroxyl ion . A) methylacetate. B) acetonitrile. C) dimethyl ether. D)acetamide.

Posted by Jayaasrii?? Jayaasrii 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yo Yo Honey Singh ? 6 years, 11 months ago

ANSWER

P block stress. . How to reduce.?

Posted by Rahul Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Abc Kamboz 6 years, 11 months ago

Finding oxidation state is a very easy thing it is basically the charge present on central atomm

Fardeen Fardeen 6 years, 11 months ago

How to find oxidation state

Abc Kamboz 6 years, 11 months ago

Just do ncert ques nothing else in p block

ANSWER

Friends how is your study going for board exams

Posted by Abc Kamboz 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Abc Kamboz 6 years, 11 months ago

Reply me

ANSWER

Is there become questions made from vitamins table of class12th?

Posted by Rahul Kumar Choudhary 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

H Hy Dgjj De Yu It Dgg 6 years, 11 months ago

Yes

ANSWER

Why electron gain enthalpy of flourine is less than chlorine ?

Posted by Navya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Pratibha Ydv 6 years, 11 months ago

Due to interelectronic repulsion in flourine

Pragya Gupta 6 years, 11 months ago

Gain enthalpy of flourine less than chlorine because it is highly electronegative than other halogens atom are flourine are closer to each other less space b/w the atom

ANSWER

Why OF2 are called flourides nd Cl20 oxides ?

Posted by Navya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Gudiya Yadav 6 years, 11 months ago

In the case of OF2 flourine is more electronegative than oxygen but in the case pf Cl2O oxygen is more electronegative than chloride

ANSWER

Why only krypton nd xenon are known to for compounds?

Posted by Navya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Pragya Gupta 6 years, 11 months ago

Xenon have some prop are same in oxygen hence are reactive other element no prop

ANSWER

Explain the nature of S-O bonds in SO2.

Posted by Navya Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What are the important topics of chemistry for 2019 cbse board exam

Posted by Prashant Kumar 6 years, 11 months ago

CBSE > Class 12 > Chemistry

2 answers

Gudiya Yadav 6 years, 11 months ago

All highlighted topics of ncert book☺☺☺??

Nitika Neb 6 years, 11 months ago

You should prefer to ten year papers

ANSWER

Diffused sunlight means?

Posted by Ruhi S 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Navya Singh 6 years, 11 months ago

It means a light which is not harsh nd direct ....it is soft .... eg is sunlight

ANSWER

Why dioxygen is gas but sulphur is solid

Posted by Ruhi S 6 years, 11 months ago

CBSE > Class 12 > Chemistry

4 answers

Pragya Gupta 6 years, 11 months ago

Pragya Gupta 6 years, 11 months ago

Oxygen is electronegative small size form o2 ππ bond is gas wheras sulphur does not ability to form ππ bond big in size so it is solid at rm temp

Navya Singh 6 years, 11 months ago

Simply p pie p pie bonding

Ankur Rathore 6 years, 11 months ago

Due to small size of oxygen can form multiple bonds where as S can`t hence S bond with S8 molecule and exist in solid

ANSWER

How to convert ethanol to but-1-yne

Posted by Archana Shree 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

C6h5oc2h5+ hi

Posted by Rajnesh Mathur 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Aditi Bhat 6 years, 11 months ago

C6H5OH + IC2H5

ANSWER

NaH is an example of which hydride

Posted by Aman Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Ruhi S 6 years, 11 months ago

Ionic hydrides

ANSWER

Please tell me the calculation for weighing oxalic acid in titration for preparing 100ml of M/20 solution

Posted by Shubbu Yadav 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Why chemistry is exist as a subject

Posted by Daman Randhawa 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yo Yo Honey Singh ? 6 years, 11 months ago

If you have problem with chemistry then why have you taken science stream

ANSWER

what is mass

Posted by Bhawna Sharma 6 years, 11 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Stephon reduction reaction

Posted by Chakshu Sharma 2204 6 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Kk Jangid 6 years, 11 months ago

RCN + SnCl2 + hcl = RCH=NH (H3O+)
=RCHO

Yogita Ingle 6 years, 11 months ago

The Stephen's reaction is used to prepare aldehydes from nitriles or cyanides. The reduction of nitriles with stannous chloride and hydrogen chloride in ethyl acetate solvent produces imine intermediate. The hydrolysis of this intermediate with water gives the corresponding aldehyde.

R-CN {tex}\xrightarrow[{HCl}]{SnCl_2}{/tex} [R-CH=NH²⁺ ][Cl^-] {tex}\;\xrightarrow{H_2o}{/tex} R-CHO

Example : Methyl cyanide to acetaldehyde preparation by stephen’s reaction is as follows:

CH₃CN + 2[H] {tex}\xrightarrow[{HCl}]{SnCl_2}{/tex} CH₃-CH-NH {tex}\;\xrightarrow{H_2o}{/tex}CH₃CHO + NH₃

Aarjan Ranjan 6 years, 11 months ago

RCN + SnCl2 + HCl > RCH=NH + H3O > RCHO Since SnCl2 is an expensive reagent DIBAL-H is used to create aldehyde from Nitriles

ANSWER

Important topics for board of 2019

Posted by Sam Dhanju 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Shama Shama Sheikh 6 years, 11 months ago

naming reaction in organic chemistry,,

ANSWER

Cottrell's smoke precipitator is fitted at the mouth of chimney used in factories. Give reasons.

Posted by Ankit Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Aarjan Ranjan 6 years, 11 months ago

To coagulate or neutralise the charged particles of smoke and store them in a container and hence reduce the quantity of pollutants . (Electricity is flown in the precipitator)

ANSWER

What does reciprocal of gold number indicate??

Posted by Ankit Singh 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

Gold number is the minimum amount of protective/lyophilic colloid in milligrams which prevents the flocculation of 10ml gold sol by the addition of 1 ml of 10%NaCl solution.
Reciprocal of gold number indicates the protective power of a colloid. Smaller is the gold number, more is the reciprocal and thus more is the protecting power of the protective colloid.