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

Iodoform test---- 2-pentanone being a methy ketone when treated with NAOI(I2+NAOH) gives yellow precipitate of iodoform but 3-pentanone does not...... CH3CH2CH2COCH3 + 3NAOI ----------> CH3CH2CH2COONA(sodium butyrate ) + CHI3(iodoform) + 2NAOH CH3CH2COCH2CH3 + NAOI ---------> no reaction Is it helpful???

2Thank You

ANSWER

All naming reactions of organic chemistry

Posted by Aaryan Jaiswal 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Lagan Khandelwal 6 years, 10 months ago

All reaction cant be written so simply, you can contact me, on Instagram i can send you the pdf of all name reactions, Ig profile - lagankhandelwal

1Thank You

ANSWER

What should i read for pblock elements

Posted by Manoj Kumar 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Lagan Khandelwal 6 years, 10 months ago

One n only ncert, no other book is ever required for chemistry and biology

2Thank You

ANSWER

What are the different oxidation states exhibited by lanthnoids

Posted by Yash Bajpai 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Yashvi Sharma 6 years, 10 months ago

+3 oxidation state is commonly found But they also show +2 and +4 in solid compounds or solutions.

3Thank You

ANSWER

Explain how much portion of an atom located at 1.the corner 2.body centre of a cubic unit cell is part of its neighbouring unit cell

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

G K 6 years, 10 months ago

Corner - 1/8th part , body centre - full part ,

4Thank You

ANSWER

Give the parameter that characterize a unit cell

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Yashvi Sharma 6 years, 10 months ago

1) it's three edges(a,b,c) and 2) it's angle between the edges (alpha beta and gamma

1Thank You

ANSWER

What happened when (NH4)2Cr2O7 is heated

Posted by Ankit Ankit 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Gagan Preet Kaur 6 years, 10 months ago

Ammonium dichromate decomposes when heated to give N2,Cr2O7

1Thank You

G K 6 years, 10 months ago

N2 + H2O + Cr2O3 .......very important for preparation for N2 gas....

0Thank You

ANSWER

The amorphous solids are also known as..

Posted by Khushi Verma 6 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

G K 6 years, 10 months ago

Pseudo solid

3Thank You

Khushi Verma 6 years, 10 months ago

Any other name plz

0Thank You

Umesh Beniwal 6 years, 10 months ago

Super cooled liquids

3Thank You

ANSWER

What is the formula of compound of phosphorus which is obtained when con. HNO3 oxidises P4

Posted by Ayushi Jadaun 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

P block how to prepare?

Posted by Bharat Rohilla 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Khushi Verma 6 years, 10 months ago

Just simply learn the different trends related to p block elements. Such as at. Size, no., bond length, bond angle, bond dissociation enthalpy, ionisation enthalpy, electronegativity or positivity. By these trends the way of answering become easy and quick. Also learn reactions as well as structures related to chapter. These things are sufficient for exam purpose.

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why carboxylic acid cannot be reduced by NaBH4 but is possible with liAlH4 when both of them r reducing agents?

Posted by Sara Khan 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Mir Arastoo 6 years, 10 months ago

NaBH4 is weak R.A (gives 1 H+) whereas LiAlH4 is strong R.A (gives 2 H+).

3Thank You

Suhani Rana? 6 years, 10 months ago

NaBH4 is only applicable for reduction of carbonyll part i.e of aldehyde and ketone.

4Thank You

ANSWER

Why is adsorption always exothermic?

Posted by Vikas Deep 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Avral Gautam 6 years, 10 months ago

As the molecule adsorb than there entropy decreases and gibbs energy gets negative due to this it release energy so exothermic

0Thank You

Thakur Maniendra Singh 6 years, 10 months ago

*, $-when be mix two different solutions which have low intrer molecular interaction during this energy reliese so adsorption is exothermic

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ANSWER

The Aqueous Solution of amines is? 1. Acidic 2. Basic 3. Amphoteric 4. Neutral.

Posted by Shaswat Srivastav 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Avral Gautam 6 years, 10 months ago

Why basic- because on teaction---RNH2+H2O= RNH3+ + OH-

0Thank You

Vivek Vishal Mishra 6 years, 10 months ago

2.basic

2Thank You

ANSWER

Weight of ch 5 chemistry

Posted by Harsh Jatrana 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Mir Arastoo 6 years, 10 months ago

4 marks

1Thank You

ANSWER

Halo form reaction

Posted by Vaishno Gour 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

N Aaditya 6 years, 10 months ago

RCOCH3+X2/base→RCOOH+CHX3 Xmay be Cl ,Br .we can also use aldehyde.

1Thank You

ANSWER

Halo form r×n

Posted by Vaishno Gour 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Vapor pressure

Posted by Satyanarayan Rath 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

N Aaditya 6 years, 10 months ago

The pressure exerted by the Vapour particles on the Wall of container at equilibrium position

1Thank You

ANSWER

Name all the distinguish test in class 12 chemistry

Posted by Ankita Srivastava 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Khushi Verma 6 years, 10 months ago

Alky halides, germinal and vicinal chlorides, Na metal test.

1Thank You

Sanjay Dubey 6 years, 10 months ago

Lucus test, tollens test,fehling test,iodoform test,carbylamine test,heisnberg reagent test

1Thank You

ANSWER

Is oswall sufficient

Posted by Shivam Bhati 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Rahul Choudhary 6 years, 10 months ago

Study from xam idea

0Thank You

ANSWER

Give the chemistry of Victor Meyer test ?

Posted by Adity Kumari 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

If I have 6 subject( PCM with three languages ) then which 5 are preffered according to current rules in cbse 2019

Posted by Shivam Sharma 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Avral Gautam 6 years, 10 months ago

Pcm+English +higest marks in other 2

0Thank You

ANSWER

Give a test to distinguish between ethylamine and aniline

Posted by Sahana Sankar 6 years, 10 months ago

CBSE > Class 12 > Chemistry

4 answers

Avral Gautam 6 years, 10 months ago

Aniline will form diazonium salt than after reacting it with phenol it give orange color dye

0Thank You

Shubham Sharma 6 years, 10 months ago

Diazotization test Ehtyl amine will give immediate bubbling if N2 while aniline will produce N2 on heating

2Thank You

Suhani Rana? 6 years, 10 months ago

Bromine water test. Aniline react with Br2(aq.) to form white ppt of 2,4,6-Tribromoaniline but not ethylamine

2Thank You

Shivam Bhati 6 years, 10 months ago

Carbaylamine test

1Thank You

ANSWER

Calculate the work done when 5 moles of an ideal gas are expanded isothermally and reversibly at 330k from 40m cube to 80m cube

Posted by Manoj Waghmare 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which of the following compound reducesTollen's reagent? (a) C6H5No2 (b)C6H5NO (c)C6H5NH3 (d)C6H5NHOH

Posted by Deepti Shukla 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Deepak Kumar 6 years, 10 months ago

Tollens' reagent is a chemical reagent used to determine the presence of aldehyde, aromatic aldehyde, and alpha-hydroxy ketone functional groups. The reagent consists of a solution of silver nitrate and ammonia.

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ANSWER

Raju was struggling from stomach ache because of hyper acidity condition. His friend, Ramesh offered him ‘Soda water’ (Aqueous NaHCO3), While Ratan wanted Raju to take ‘Gelusil’ (Aluminium hydroxide gel). a) Should Raju follow Ramesh’s advice or Ratan’s? b) What is the advantage of one medicine over the other? c) What are the values associated with the three friends’ reactions?

Posted by Chitra Rawat 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Chitra Rawat 6 years, 10 months ago

I know but the questions in this vbq is imp

0Thank You

Shivam Bhati 6 years, 10 months ago

Value based questions will not come from this year

0Thank You

ANSWER

What are colligative properties?

Posted by Atul Kumar 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Suhani Rana? 6 years, 10 months ago

It is the property of ideal dilute solution which depend upon only on number of non volatile solute added and not on their nature.

2Thank You

ANSWER

Pyroelectricity

Posted by Suyash Tripathi 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Nitika Neb 6 years, 10 months ago

Pyroelectricity is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. Pyroelectricity can be described as the ability of certain materials to generate a temporary voltage when they are heated or cooled

1Thank You

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