CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

Structural isomerism, or constitutional isomerism, is a form of isomerism in which molecules with the same molecular formula have different bonding patterns and atomic organization, as opposed to stereoisomerism, in which molecular bonds are always in the same order and only spatial arrangement differ

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Why formaldehyde give tollen test but acetic acid not??

Posted by O Singh 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yuvraj Sharma 7 years ago

Because formaldehyde has only one carbon (HCHO)

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What is shape selective catalyst?

Posted by Adrika Awasthi 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Aryan Rai 7 years ago

The catalyst which shows preference or selectivity towards a reactant or substrate because of its shape or size is called a shape selective catalyst. These catalytic reactions depend on the pore structure of the catalyst and the size or shape of the substrates and products. e.g. Zeolites.

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Dffrince between aldehyde and ketone

Posted by Jatin Verma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

O Singh 7 years ago

In aldehyde RCHO grp present but in ketone RCOR grp present. Difference is that in ketone 2 alkyl grp attach to carbonyl grp but in aldehyde only one alkyl grp.

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Grabil thalamus reaction

Posted by Raj Xetri 7 years ago

CBSE > Class 12 > Chemistry

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Anybody having notes of p,d and f block?

Posted by Aryan Rai 7 years ago

CBSE > Class 12 > Chemistry

4 answers

Aryan Rai 7 years ago

@ Ritu can you send me notes on my gmail id or number whichever way you are comfortable with?

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Ritu Bishnoi 7 years ago

I have whole chapters notes ..of chemistry but here there is no option for uploading pics...

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Aryan Rai 7 years ago

Can you send me pics?

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Srivinayak V 7 years ago

D and f i have it

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How to convert benzene into m metyl chloro benzene

Posted by Sant Prasad 7 years ago

CBSE > Class 12 > Chemistry

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Based on the nature of intermolecular forces classify the solids SiC

Posted by Naveen Shilam 7 years ago

CBSE > Class 12 > Chemistry

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Write the process of extraction of Copper and zinc

Posted by Ashu Dubey 7 years ago

CBSE > Class 12 > Chemistry

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Explain about unstability of diazonium salt of primary amines

Posted by Mohd Arsalan 7 years ago

CBSE > Class 12 > Chemistry

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Give a test to distinguished between phenol and benzoic acid

Posted by Akshat Negi 7 years ago

CBSE > Class 12 > Chemistry

2 answers

O Singh 7 years ago

NaHCO3 test

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Vineet Kumar Gupta 7 years ago

Fecl3 test

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Bhaiyon aap kya organic me meri help kr skte hai

Posted by Virendra Singh 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Mitali Pant 7 years ago

Yes

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Praveen Lamba 7 years ago

Nhi

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How to convert benzene to m-ethyl chlorobenzene

Posted by Ravi Choudgary 7 years ago

CBSE > Class 12 > Chemistry

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Sulphuric acid not used during the reaction of alcohols with KI.Explain why?

Posted by Muskan Rohilla 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Mansi Sharma 7 years ago

Because it react to form I2

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Lalit Kumar 7 years ago

See NCERT Example

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Glucose or sucrose are soluble in water but cyclohexane or benzene are insoluble in water explain??

Posted by Srivinayak V 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Yuvraj Sharma 7 years ago

Glucose and sucrose have strong hydrogen bonding as compare to cyclohexane and benzene and these are polar compound it is also one reason behind it

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How will you convert ethanol to 3 hydroxybutanol?

Posted by Ajay Kumar 7 years ago

CBSE > Class 12 > Chemistry

1 answers

H!Mαη$Hμ Ұαδαυ ✔️ 7 years ago

By adding Cu 573K in ethanol you can form ethanal and then use Aldol reaction....by adding dil. NaOH.....

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Give examples of f-centre.

Posted by Jyoti Yadav 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Ajay Kumar 7 years ago

Refer to ncert..

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Mansi Sharma 7 years ago

When Nacl heated in Na vapours the colour changes to yellow .

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If a currentof 0.5 amperes flows through a metallic wire for 2 hours then how many electron would flow through wire.

Posted by Iqsh Suman 7 years ago

CBSE > Class 12 > Chemistry

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Gulcose despite having aldehyde group doesnot give Schiff 's test .why ??

Posted by Gurleen Kaur 7 years ago

CBSE > Class 12 > Chemistry

2 answers

Gurleen Kaur 7 years ago

But the structure of glucose is CHO ⬅ it contains cho gp H- OH. Then why it is not aldehyde ??..... OH- H H- OH H- OH CH HO H

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Yash Surya 7 years ago

Glucose is a biomolecule which doesn't have any aldehyde group as the schiff's reagent is used to reduce simply aldehyde groups

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Classify the following compound as diatomic,triatomic and polyatomic 1•HCL, H2, H2O, NH3

Posted by Baldwin Embhahlang Sungoh 7 years ago

CBSE > Class 12 > Chemistry

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What are f centres? What are their functions?

Posted by Db Morengam 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Prakhar Gupta 7 years ago

An ionic vacancy containing unpaired electron is known as f centre

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Chapter wise marks distribution for cbse board

Posted by Ajay Kumar 7 years ago

CBSE > Class 12 > Chemistry

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Explain in brief freundlich adsorption isotherm .

Posted by Mansi Sharma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Nitika Neb 7 years ago

It is a graph drawn between the amount of adsorbate adsorbed per gram of adsorbent x/m with respect to pressure at constant temp

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Explain in brief the principle of column chromatography . Fast plz .....

Posted by Mansi Sharma 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Srivinayak V 7 years ago

It is based on the principle of separation or purification by chromatography Al2O3 is used as adsorbent. The mixture to be separated is taken in suitable solvent and applied on the coloumn.They are eluted out using suitable solvent. The weakly absorbed component is eluted first ,then the more strongly adsorbed on. This method is suitable for those elements which are available only in minute quantity and these impurities are not very much different in their chemical behaviour from the element to be purified

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What are epimers?

Posted by Srivinayak V 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Aryan Rai 7 years ago

Those stereoisomers which are differing in its configuration at only one chiral carbon atom are called as Epimers. e.g, glucose and galactose are Epimers of each other, as they differ in only in the position of hydroxyl group at C4(chiral carbon atom).

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Out of butan-1-ol and butan-1-amine , which will be more soluble in water and why?

Posted by P S 7 years ago

CBSE > Class 12 > Chemistry

1 answers

Tara Chauhan 7 years ago

Butanol is more soluble than butan1 amine as butanol have OH and also water is of H+and OH- in short can say OH groups arevery much similar to water molecules. This is also due polarity as they are more polar than N H bonds so that the intermolecular force will be stronger..

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Uses of rhamnose (C6 H12 O5)?

Posted by Srivinayak V 7 years ago

CBSE > Class 12 > Chemistry