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

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

Aldehydes are more reactive than ketones towards Nucleophiles. give reason.

Posted by Šąhîł Phogat 5 years, 11 months ago

CBSE > Class 12 > Chemistry

3 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

Aldehydes -CHO show resonance in which the C=O Double bond is converted into a single bond. This leads to formation of charged ions . But Nucleophiles or e- rich species attack the positive charged ion and thus get attached to it, leading to a nucleophilic addition. It occurs more easily in Aldehydes than Ketones because Aldehydes show resonance while Ketones don't. hope it help bro

Šąhîł Phogat 6 years, 4 months ago

very appropriate answer. thank you Darshan

Ďãřşháñăã Yadav ? ? ? 6 years, 4 months ago

Aldehydes are more reactive than ketones towards Nucleophiles due to steric and electronic reason. sterically the presence of 2 relatively large substitute in ketones hinders the Approach of Nucleophile to carbonyl carbon than aldehyde having only 1 such subunits. electronically aldehyde are more reactive than ketones becoz the presence of 2 alkyl grp in ketones exert +I effect which increases electron density on carbonyl carbon thereby reducing the elecyrophillicity on carbonyl carbon than in aldehydes where only one alkyl grp is present.

ANSWER

Atomic bomb

Posted by Muzaffar Husain 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

K@Łp@N@ $Øđh!?? 6 years, 4 months ago

bomb that explodes using the energy that is produced when an atom or atoms are split

ANSWER

how does the number of collision changes on increasing the temperature

Posted by Amol Gùpta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

5 answers

Hritwik Raj 6 years, 4 months ago

Since no of collision is diretly proportional to temp. ..... On increasing temp. kinetic energy between particles increases hence no of collision increases

Amol Gùpta 6 years, 4 months ago

Who is that ??

Divya Garg 6 years, 4 months ago

Increases

Harshit Shekhar 6 years, 4 months ago

Increasing temperature increases kinetic energy of the particles, due to increase in kinetic energy randomness of particle increases. Thus no. Of collision increases.

Rudra Singh 6 years, 4 months ago

When we increases the temperature then the surface area increases. As a result, no. Of collision increases. Thus, no. Of collision changes on increasing the temperature.

ANSWER

What is d-d transition?

Posted by Aman Rawat 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

K@Łp@N@ $Øđh!?? 6 years, 4 months ago

In a d–d transition, an electron in a d orbital on the metal is excited by a photon to another d orbital of higher energy. In complexes of thetransition metals, the d orbitals do not all have the same energy. In centrosymmetric complexes, d-d transitions are forbidden by the Laporte rule.

Nishu Goyal 6 years, 4 months ago

The movement of electron from t2g to eg for extrs stability. For more info read chapter coordination compounds

ANSWER

Which is the most stable compound in organic chemistry?

Posted by Supriya Kumari 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Supriya Kumari 6 years, 3 months ago

Aromatic compound

K@Łp@N@ $Øđh!?? 6 years, 4 months ago

alpha-alumina

Chesta Bari 6 years, 4 months ago

Benzene

ANSWER

Why do reaction maintain edulibrium to each other?

Posted by Supriya Kumari 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Chesta Bari 6 years, 4 months ago

Because of lichaterlir principle

ANSWER

Sample paper for class12 chemistry 2019-20

Posted by Anu Atri 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Format of 2019 _20 chemistry paper

Posted by Ampili Tvla 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Which new chapter is added in cbse 12th chemistry syllabus

Posted by Sameer Nehra 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Rudra Rajput 6 years, 4 months ago

Syllabus is almost same but ch solid-state and grp 15 is removed from pblock

Muskan Bamel 6 years, 4 months ago

Solid state also removed

Namrata Singh 6 years, 4 months ago

Whole syllabus is same. Only nitrogen family has removed from p-block

ANSWER

What should I do when both strong and weak nucleophile are present in the reaction?? which mechanism should i choose Sn1 or sn2??

Posted by Vineet Parashar 6 years, 4 months ago

CBSE > Class 12 > Chemistry

2 answers

Vineet Parashar 6 years, 4 months ago

Is that mean if alkyl halide is of 1° then it follow sn2???

Harshit Shekhar 6 years, 4 months ago

Sn1 or sn2 mechanism does not depend on nature of nucleophile..it depends on the structure of compound.

ANSWER

Give me example of daily life multimolecular collide

Posted by Annu Khandey 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Rohit Parajapati 6 years, 4 months ago

Gold Sol Sulphur Sol.

ANSWER

Mechanism of kolbe reaction

Posted by Loveneet Saini 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

1m kcl and 1m urea which has high freezing point

Posted by Khushi Baurasi 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is collision theory ?

Posted by Jeremiah Joseph 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Gargi Varshney 6 years, 4 months ago

Collision theory, theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.

ANSWER

What are the factors that affect the solubility of gases?

Posted by Jesna Jesna 6 years, 4 months ago

CBSE > Class 12 > Chemistry

5 answers

K@Łp@N@ $Øđh!?? 6 years, 4 months ago

Solubility is the maximum amount of a substance that will dissolve in a given amount of solvent at a specific temperature. There are two direct factors that affect solubility: temperature and pressure. Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases.

Divyanshu Gupta 6 years, 4 months ago

3 factors -(Temperature) (Pressure) (Nature of gas)

Annu Khandey 6 years, 4 months ago

Temperature and pressure Mole fraction

Yogita Ingle 6 years, 4 months ago

Three factors: solubility of the gas in the liquid; (ii) temperature; (iii) partial pressure of the gas above the solution.
Explanation:
This is classic chemistry of the 19th century; see Henry's Law.
Increasing the temperature of a liquid will increase the solubility of the gas dissolved in the liquid.

Anuj Jha 6 years, 4 months ago

Temperature and pressure

ANSWER

Platinum is oxidising or reducing agent

Posted by Anuj Jha 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Annu Khandey 6 years, 4 months ago

Platinum is a catalyst but can be used as a reducing agent ?

Anuj Jha 6 years, 4 months ago

But platinum act as catalyst

Kanhaiya Nayak 6 years, 4 months ago

Oxidizing

ANSWER

What is difference between rate of reaction and reaction rate constant..? At least 3 points for each.

Posted by Priya Dharshini ? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

4 answers

Priya Dharshini ? 6 years, 4 months ago

YA.. i just said thanks and reported.. god knows who thought what..? we need to get used to this cbse..

Priya Dharshini ? 6 years, 4 months ago

Who reported this... i didnt say something wrong.?

Aadi Ahluwalia 6 years, 4 months ago

No need

Aadi Ahluwalia 6 years, 4 months ago

Difference between rate of reaction and reaction rate constant are as follows: RATE OF REACTION REACTION RATE CONSTANT Rate of reaction is the change in concentration of a reactant or product per unit time. It is a constant of proportionality in the rate law equation and is equal to the rate of reaction when the molar concentration of each of the reaction is unity. The rate of reaction at any instant of time depends upon the molar concentrations of the reactants at that time. The rate constant is constant for a particular reaction at a particular temperature and does not depend upon the concentrations of the reactants. Its units are always moles litre It units depend upon the order or reaction. A reaction is said to be of the zero order, first order, second order, and third order if some of concentration terms is equal to 0, 1, 2 and 3 respectively

ANSWER

Obsetve the rxn.identify the order of rate of rxn r1 r2 r3 r4

Posted by Anita Nair 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Mudit Kashyap 6 years, 4 months ago

Moles of reactant

ANSWER

how many optical isomer are possible with one chiral carbon

Posted by Prashant Awasthi 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Harshit Shekhar 6 years, 4 months ago

Only two i.e.laevorotatory and dextrorotatory

Annu Khandey 6 years, 4 months ago

Only two isomer can be formed One will be the mirror image of the compound Both together called enatiomer Nd there mixture is racemic ie totally inactive ?

Yogita Ingle 6 years, 4 months ago

There is only one central chiral carbon atom in lactic acid. It exists in two different forms of optical iosmers as shown below -

ANSWER

Show that for a first order reaction the time required for half the change(half-life period) is independent of initial concentration.

Posted by Alok Kumar Shah 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 6 years, 4 months ago

For a first order reaction, rate constant,
{tex}k=\frac{2303}{t} \log \frac{[R]_{0}}{[R]}{/tex}
When {tex}t=t_{1 / 2^{\prime}}[R]=\frac{[R]_{0}}{2}{/tex}
{tex}t_{1 / 2}=\frac{2303}{k} \log \frac{[R]_{0}}{[R]_{0} / 2}{/tex}
{tex}t_{1 / 2}=\frac{2303}{k} \log 2=\frac{2303 \times 03010}{k}{/tex}
{tex}t_{1 / 2}=\frac{0693}{k}{/tex}
For a first order reaction, half-life period is constant. It is independent of initial concentration of the reacting species.

ANSWER

Explain chromatography in briefly...

Posted by A ? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Nishu Goyal 6 years, 4 months ago

Based on adsorption phenomenon. More dilute solution will reach at higher place on chromatograph paper . So by locating position of solution we can find concentration of solution

ANSWER

PH3 has lower boiling point tha NH3 why

Posted by K@Łp@N@ $Øđh!?? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Mudit Kashyap 6 years, 4 months ago

Electronegetivity

Mudit Kashyap 6 years, 4 months ago

Due to hdrogenboding

A ? 6 years, 4 months ago

Due to hydrogen bonding. As in the NH3 molecules, there is bond between N-H , the hydrogen bond. These hydrogen bonding are considered strong bonds So there is more force required to break them which is essential in order to change the state of the substance or to convert it in to vapor. While in case of PH3 the weak inter-molecular forces are present .This why NH3 boiling boint is quite high.

ANSWER

Give the chemical reaction to support that +5 oxidation state of Bi is less stable than +3 state

Posted by K@Łp@N@ $Øđh!?? 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Dipole moment formula of f block elements jawab correctly aata ho to hi jawab dena

Posted by Tannu Madaan 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Sahi hai sis..kyunki maine dekha hai ki tumhare question mai ek baar kisi ne yeh kaha tha ki hume kya pata...i understand

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

sub tebhi jawab dete hai jub unhay aata hai... lagta hai tumhe jyada he aata hai ?

Řøhăň Řąjpůť ✌️✊ 6 years, 4 months ago

μ = underoot (n(n+2))....

ANSWER

15 chemicals reaction of alcohaol and phenol

Posted by Ashwin Bhaydiya 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Tolens reaxon ??

Posted by Dhruvrajsinh Gol 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is lucas reagent?? Pls hlp

Posted by Amol Gùpta 6 years, 4 months ago

CBSE > Class 12 > Chemistry

13 answers

Srishti Choudhary ✍⏳ 6 years, 4 months ago

Thnks yrr!!

Î$Hîkâ Gûptâ???? 6 years, 4 months ago

accha then its okk best of luck for your exams

Srishti Choudhary ✍⏳ 6 years, 4 months ago

Lgaataar!!

Srishti Choudhary ✍⏳ 6 years, 4 months ago

Yrr..exam h Tuesday s

Amol Gùpta 6 years, 4 months ago

Kyu

Srishti Choudhary ✍⏳ 6 years, 4 months ago

Nhi!! M offline thi!! Or ab b shaayad kbhi kbhi aau yaha pr!!!

K@Łp@N@ $Øđh!?? 6 years, 4 months ago

Lucas' reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is used to classify alcohols of low molecular weight. The reaction is a substitution in which the chloride replaces a hydroxyl group.

Amol Gùpta 6 years, 4 months ago

Haa

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

Ishika tumne bio li hai

Gargi Varshney 6 years, 4 months ago

Concentrated HCl+ZnCl2

Yogita Ingle 6 years, 4 months ago

Lucas reagent is a solution of anhydrous ZnCl₂ & conc.HCl. This solution is used to classify alcohols of low molecular weight. This reaction is substitution in which a chloride replaces hydroxyl group. It is to differentiate between Primary, Secondary & tertiary alcohols.

ROH + HCl ------> RCl + H2O

Amol Gùpta 6 years, 4 months ago

Thanks ..... Is that you shrishti

S.... ????☺ 6 years, 4 months ago

ZnCl2 + HCl

ANSWER

Is O2 show hybridisation?? If not than why?

Posted by Nancy Goyal 6 years, 4 months ago

CBSE > Class 12 > Chemistry

1 answers

Saheb Ok 6 years, 4 months ago

Yes

ANSWER

Co2+ is easily oxidised to Co3+ in the presence of a strong ligand.Why?

Posted by Kartik Sharma 6 years, 4 months ago

CBSE > Class 12 > Chemistry

3 answers

Mudit Kashyap 6 years, 4 months ago

High

Mudit Kashyap 6 years, 4 months ago

Because of reducing agent

Sandeep Singh 6 years, 4 months ago

Yess

ANSWER

Convert benzyl alcohol to 2 phenyletanoic acid

Posted by Rajendra Prasad 6 years, 4 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Page 164 of 608

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App