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

Due to lower energy in 4s orbital as compare to 3d orbital in 4s orbital have lower value of (n+l) in which filling of electron will occur easily as compare to 3d orbital.(n+l) rule is decide the energy level of the orbitals.

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Which questions areImportant coming in board exam of chapter biomolecules

Posted by Smarty Sahil 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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Why are the clouds are appear white

Posted by Entertain Zone 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Anurag Dahiya 6 years, 2 months ago

The clouds are at lower height.They are seen due to scattering of light from lower parts of the atmosphere,which contains large dust particles , water droplets and ice particles.In the case size of scatterer is very large than wavelength of colours.Therfore all wavelength are scattered equally and they merge to give a commom sensation of white colour .Hence clouds generally appear white

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How many chiral carbon in alpha D glucose?

Posted by Surender Grover 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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Khuskaran Sidhu 6 years, 2 months ago

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Deeya Singh 6 years, 2 months ago

There are 5 chiral carbons in alpha D Glucose. They are: C1, C2, C3, C4, C5.

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Chemistry practical

Posted by Shivani Singh 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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Vibhor Sharma 6 years, 2 months ago

Edunovus Online YouTube channel. Best Guidance for chemistry practical ?

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Practical chemistry

Posted by Shivani Singh 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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Vibhor Sharma 6 years, 2 months ago

(Edunovus Online) Youtube channel ?

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What is difference b/w benzeneamine and benzamine

Posted by Taru Hada 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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out of oxygen and sulphur which one has less magnitude of electron gain enthalpy and why

Posted by Dishant Sahi 6 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Deeya Singh 6 years, 2 months ago

The answer is Oxygen. This is because of the small size of O. When O gains an electron, the electrons in its shells experience electron-electron repulsion, because of its small size and also due to the absence of d orbitals. While in S, it can gain an electron easily due to the presence of d orbitals. Thus, O releases less energy and than S after gaining an electron.

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Entertain Zone 6 years, 2 months ago

May be oxygen

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How long will it take an electric current of0.15A to deposit all the copper from 500ml of 0.15M CuSO4 solution

Posted by Priyanshi Jaiswal 6 years, 2 months ago

CBSE > Class 12 > Chemistry

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Convert benzene to aniline

Posted by Aakash Verma 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Khushi Rai 6 years, 2 months ago

BENZENE----------------(in presence of HNO3/H2SO4)(NITRATION)----------- NITROBENZENE----------------(in presence of HCl/Sn)(REDUCTION)-----------form ANILINE DOT SHOW ARROW ND BRACKET MATERIAL IS UPON ARROW.... THNQ?

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What is isopreyll alcohol

Posted by Yogesh Lohar 6 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Sia ? 6 years, 2 months ago

Isopropyl alcohol dissolves a wide range of non-polar compounds. It also evaporates quickly, leaves nearly zero oil traces, compared to ethanol, and is relatively non-toxic, compared to alternative solvents.

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Khuskaran Sidhu 6 years, 2 months ago

Ch3ch(oh)ch3

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Why can not molecularity of any reaction be equal to zero?

Posted by Ankit Aryan Shivan 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 2 months ago

Molecularity is the number of molecules taking part in an elementary step. For this we require at least a single molecule leading to the value of minimum molecularity of one.

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Conversion propene to propanal

Posted by Deep Raj 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Deeya Singh 3 years ago

Add water to propene in presence of hydrogen peroxide. So, what you get is Propan-1-ol (Anti-markonikoff rule). Now, oxidise this product in presence of mild oxidising agent, like PCC, and then what you get is Propanal.

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What is SN1 and SN2 reaction

Posted by Sanidhya Shrivastava 6 years, 2 months ago

CBSE > Class 12 > Chemistry

3 answers

Gagan Singh 6 years, 2 months ago

SN1 is 2step reaction and SN2 is one step reaction

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Deeya Singh 6 years, 2 months ago

The SN1 reaction is a substitution reaction in organic chemistry. "SN" stands for "nucleophilic substitution", and the "1" says that the rate-determining step is unimolecular. The SN2 reaction is a type of reaction mechanism that is common in organic chemistry. In this mechanism, one bond is broken and one bond is formed synchronously, i.e., in one step, and the "2" says that the rate determining step is bimolecular.

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Ridhi Goyal 6 years, 2 months ago

SN1 is a first order reaction ,two step reaction ,3>2>1 3 carbocation is more stable due to +i effect. SN2 is a second order reaction ,one step reaction ,1>2>3 carbocation is more stable ..........

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What is packing efficiency?

Posted by Rizwana Multani 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Kailey 6 years, 2 months ago

What do you mean by akelshion

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What is interestitial compound

Posted by Rekha Patidar 6 years, 2 months ago

CBSE > Class 12 > Chemistry

1 answers

Gaurav Seth 6 years, 2 months ago

The compounds in which small atoms like H, C, N, etc., occupy interstitial sites in the crystal lattice are called interstitial compounds.
These compounds are well known for transition metals because small atoms can easily occupy the positions in the voids present in the crystal lattices of transition metals.

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Plz tell me the important name reactions

Posted by Prince Kumar 6 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Jd Chouhan 6 years, 2 months ago

Swarts reaction also ....

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Shikha Maurya 6 years, 2 months ago

Aldol condensation,cross aldol condensation,balz-schiemann reaction,carbylamine reaction,cannizzaro reaction,clemmensen reduction,Etard reaction, Finkelstein reaction,friedel craft reaction,garbriel phthalimide synthesis,gattermann-koch synthesis,gattermann reaction,hell volhard zelinsky reaction,hoffmann bromamide reaction or Hoffmann degradation of amides,kolbes reaction, iodoform reaction,riemer tiemann reaction,rosenmund reaction,sandmeyer reaction,stephen reduction reaction,williamson synthesis,wolff kishner reduction,wurtz reaction ,wuttz fittig reaction,swarts reaction

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What is saytzeff's rule?

Posted by Rishita Shishir ?✏ 6 years, 2 months ago

CBSE > Class 12 > Chemistry

2 answers

Deeya Singh 6 years, 2 months ago

The alkene formed in greatest amount is the one that corresponds to removal of the hydrogen from the β-carbon having the fewest hydrogen substituents.

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Mukul Bhardwaj 6 years, 2 months ago

In dehydrohalogenation the prefered product is that alkene which have greater no halogen attached to the doubly bonded carbon atom

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Henry law mathematical expression

Posted by Deepak Lamba 6 years, 2 months ago

CBSE > Class 12 > Chemistry