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O2H Group
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I applied via Walk-in and was interviewed in Dec 2024. There was 1 interview round.
It was good test with mathematical learning
I applied via campus placement at Vel tech multitech dr.rangarajan dr.sakunthala engineering college, Chennai and was interviewed in Sep 2024. There was 1 interview round.
It was pretty easy focusing on quantitative aptitude
About full stack, and personal development
Coding and skill based test
O2H Group interview questions for popular designations
Esters can be converted to aldehydes by hydrolysis under acidic conditions.
Esters can be hydrolyzed to aldehydes using a strong acid, such as sulfuric acid or hydrochloric acid.
The reaction involves the cleavage of the ester bond and the formation of a carboxylic acid intermediate, which is then further reduced to an aldehyde.
The reaction can be carried out at elevated temperatures or using a catalyst, such as p-toluen...
The desired product of bromination on aniline is 2,4,6-tribromoaniline. The desired product of bromination on toluene is bromotoluene.
Bromination on aniline results in the substitution of three bromine atoms on the aromatic ring, yielding 2,4,6-tribromoaniline.
Bromination on toluene results in the substitution of one bromine atom on the aromatic ring, yielding bromotoluene.
The Grignard reaction on an aldehyde will produce a secondary alcohol.
The Grignard reaction involves the addition of a Grignard reagent (organomagnesium compound) to an aldehyde or ketone.
The reaction proceeds through the formation of a carbon-carbon bond.
In the case of an aldehyde, the product will be a secondary alcohol.
For example, the reaction of formaldehyde (HCHO) with a Grignard reagent such as methylmagnesium b...
Diastereomers and enantiomers are types of stereoisomers that differ in their spatial arrangement.
Diastereomers are stereoisomers that have different configurations at one or more chiral centers but are not mirror images of each other.
Enantiomers are stereoisomers that are non-superimposable mirror images of each other.
Diastereomers have different physical and chemical properties, while enantiomers have identical physi...
The biaryl product can be synthesized through a variety of methods.
One common method is the Suzuki-Miyaura cross-coupling reaction.
Another method is the Buchwald-Hartwig amination reaction.
Transition metal-catalyzed C-H activation can also be used.
Examples of biaryl products include biphenyl and terphenyl.
The method for preparation of amide involves the reaction between a carboxylic acid and an amine.
Amides can be prepared by the reaction of a carboxylic acid with an amine in the presence of a dehydrating agent.
The reaction typically requires heating and can be catalyzed by an acid or base.
The resulting product is an amide, which contains a carbonyl group bonded to a nitrogen atom.
Example: The preparation of acetamide c...
The proton NMR peak of methyl aldehyde appears as a singlet at around 9-10 ppm.
The proton NMR spectrum of methyl aldehyde shows a singlet peak.
The chemical shift of the peak is typically around 9-10 ppm.
The singlet peak indicates that the methyl aldehyde molecule has no neighboring protons.
Mass spectra of bromo chloro containing compound
Bromo chloro compounds can have multiple isomers with different mass spectra
The presence of bromine and chlorine atoms can cause fragmentation in the mass spectrum
The mass spectrum can be used to determine the molecular weight and structural information of the compound
I was interviewed before Apr 2023.
Reasoning ,maths English grammar, chemistry
I applied via Campus Placement and was interviewed in Nov 2020. There were 7 interview rounds.
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I applied via Approached by Company and was interviewed in Jul 2023. There were 2 interview rounds.
Azure PAAS, IAAS, and SAAS are different cloud service models provided by Microsoft Azure.
PAAS (Platform as a Service) - Provides a platform for developers to build, deploy, and manage applications without worrying about infrastructure.
IAAS (Infrastructure as a Service) - Provides virtualized computing resources over the internet, such as virtual machines, storage, and networking.
SAAS (Software as a Service) - Delivers...
Dependency Injection is a design pattern in which a class receives its dependencies from external sources rather than creating them itself.
Dependency Injection helps in achieving loose coupling between classes.
It allows for easier testing and maintenance of code.
There are three common ways to achieve Dependency Injection: Constructor Injection, Setter Injection, and Interface Injection.
Dotnet 6 is the latest version with new features and improvements over Dotnet 5.
Dotnet 6 has improved performance and reduced memory usage compared to Dotnet 5.
Dotnet 6 introduces Hot Reload feature for faster development iteration.
Dotnet 6 includes support for MAUI (Multi-platform App UI) for building cross-platform apps.
Dotnet 6 has enhanced support for cloud-native applications and microservices.
Dotnet 6 includes im...
Azure Functions is a serverless compute service that allows you to run event-triggered code without managing infrastructure.
Azure Functions is used for running small pieces of code or 'functions' in the cloud.
It is event-driven and can be triggered by various Azure services or external sources.
Azure Logic Apps is a workflow automation tool that allows you to automate business processes by connecting various services an...
Interfaces define a contract for classes to implement, while abstract classes provide partial implementation.
Use interfaces when you want to define a contract that multiple classes can implement.
Use abstract classes when you want to provide some common functionality to multiple classes.
Interfaces support multiple inheritance, while classes can only inherit from one abstract class.
Interfaces are used for loose coupling ...
Solid principles are a set of five design principles for writing clean, maintainable, and scalable code.
Single Responsibility Principle (SRP) - A class should have only one reason to change.
Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.
Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses without affe...
I use Logic Apps for automating workflows and Service Bus for reliable messaging.
I use Logic Apps to create automated workflows for integrating various systems and services.
I leverage Service Bus for reliable messaging between different components of a distributed system.
For example, I have used Logic Apps to automate data transfers between CRM systems and databases, and Service Bus for decoupling microservices in a cl
I applied via Approached by Company and was interviewed in Aug 2023. There were 2 interview rounds.
Behaviour subject in Angular is a special type of subject that allows both subscribing and emitting values.
BehaviourSubject is a type of subject in RxJS library.
It has an initial value that will be emitted to new subscribers.
It stores the latest value and emits it immediately to new subscribers.
Example: const subject = new BehaviorSubject('initial value');
Example: subject.next('new value');
Design principles are guidelines for designing software solutions that are maintainable, scalable, and efficient.
Design principles help in creating software that is easy to understand, modify, and maintain.
They promote code reusability, modularity, and flexibility.
Examples of design principles include SOLID principles, DRY (Don't Repeat Yourself), KISS (Keep It Simple, Stupid), and YAGNI (You Aren't Gonna Need It).
posted on 23 Aug 2023
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Focused on instrumentation techniques such as nanoparticles characterization, protein characterization methods
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