Vishal Tiwari

2021-09-13 09:51:04 Reproductive Isolation :- Prezygotic isolation and Postzygotic isolation

Prevention of inter breeding between the population of two different or closely related species
Reproductive isolation was explained by stebbian
Two types reproductive isolation are
Prezygotic isolation
Postzygotic isolation

1. Prezygotic isolation
Prevention of mating and the formation of zygote
Temporal isolation: Due to difference in breeding seasons of two species
Ecological isolation: Due to different habitats of two species
Behavioral isolation: Due to different sexual or coitus behavior of two species

2. Postzygotic isolation
The organisms mate but no offspring are produced
In viability: Zygote fails to develop
Sterility: Adults are sterile and do not produce gametes
Hybrid Breakdown: Sometimes inter specific mating produces a hybrid, but progeny is weak, abnormal or sterile. ओपन / कमेंट

2021-09-12 07:39:06 My blessings & best wishes are with you. You will do good.
ओपन / कमेंट

2021-09-12 07:39:06 Baccho !
1) Light Breakfast karke jana exam center par.
2) Listen to light music.
3) Mujhe bharosa hai u will rock
4) Darte hain kya ओपन / कमेंट

2021-09-12 07:38:40 ओपन / कमेंट

2021-09-12 07:38:28 ओपन / कमेंट

2021-09-11 07:07:19 Tricks for Conversions in Organic Chemistry

Haloalkanes can give you every possible functional group. They can also help you in increasing the chain size. So you might want to convert your starting material to haloalkanes and then go to the desired product

Remember the series of oxidation/reduction: Hydrocarbons (with various substituents) can be oxidised to alcohols, then appropriate carbonyl compounds and lastly carboxylic acids (or their derivatives)

Strong oxidizing agents are KMnO4 and K2Cr2O7

Mild oxidising agents depending on the situation are CrO4, Ammoniacal AgNO3, Benedicts Solution, Fehling’s solution, Cu or CuO at 573K, Bromine water etc.

Any carboxylic acid derivative can be converted back to the carboxylic acid by hydrolysis.

There are possibilities of hydride and methyl to get the most stable intermediate (carbocation/free radical)

A most common reaction, if your starting material is an alkane, is free-radical halogenation.

Saytzeff/Markovnikov's rules must be kept in mind while dealing with alkenes (they are based on the electron displacement effects only)

Decarboxylation and ozonolysis could go-to methods for decreasing the number of carbon atoms

Grignard reagent gives you the much-needed Alkyl nucleophile, which can be used at appropriate places. ओपन / कमेंट

2021-09-11 06:55:58 Best wishes baccho !!
Kafi mehnat kiya hai tmne !!
Bharosa rakho khud ke upar !!

Aur relax hoke exam do !!
Kuch b naya mat kro !!
Ek question b naya nahi karna hai

Dimag ko relax karo aur
Macha ke aajao !!

———
I trust u
U have worked hard beta
Vishal Tiwari is always beside u ! ओपन / कमेंट

2021-09-11 06:55:58 ओपन / कमेंट

2021-09-10 17:52:28 Hello,

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Pdhai nhi rukegi ओपन / कमेंट

2021-09-10 06:45:37 available hu mai
Telegram id : @vishalchemistry par

koi b doubt ho to puch lo
Mai khud reply karunga ओपन / कमेंट