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Yogita Ingle 6 years, 8 months ago
According to Saytzeff rule "In dehydrohalogenation reactions, the preferred product is that alkene which has the greater number of alkyl groups attached to the doubly bonded carbon atoms."
For example: The dehydrohalogenation of 2-bromobutane yields two products 1-butene and 2-butene. Out of these 2-butene is the major product (80%) as it is more highly substituted and it is more stable.
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Sanskar Tiwari 6 years, 6 months ago
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Hiru ? 6 years, 8 months ago
Posted by Wanjop Vincent 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
- Social stratification is a universal nature.
- Social stratification can be achieved and ascribed both.
- Stratification can be made horizontally or vertically.
- Social stratification is based on caste, class, gender, ethnicity, role and status.
- Social stratification may accommodate the principle of co-existence or it can be conflict based.
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Vaishnavi Gajare 6 years, 8 months ago
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Meghna Thapar 5 years, 4 months ago
The International Union for Conservation of Nature (IUCN) is the foremost authority on threatened species, and treats threatened species not as a single category, but as a group of three categories, depending on the degree to which they are threatened:
- Vulnerable species
- Endangered species
- Critically endangered species
Less-than-threatened categories are near threatened, least concern, and the no longer assigned category of conservation dependent. Species which have not been evaluated (NE), or do not have sufficient data (data deficient) also are not considered "threatened" by the IUCN.
Posted by Ningthicham Sanacham 6 years, 8 months ago
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Yogita Ingle 6 years, 8 months ago
Capillarity is a physical phenomenon in which liquids flow without the help of gravity. Liquids even rise to a height against gravity, through narrow tubes.
Capillary action is due to the phenomenon of Surface tension of liquid as well as adhesive forces between liquid molecules and molecules of the narrow tube. Surface tension is due to cohesive attraction among liquid molecules.
Derivation: When a thin (open or closed at the top) tube is inserted into a liquid in a container, the liquid inside the tube rises to a height h above the liquid surface outside. Let the diameter of the tube be D. The density of liquid be ρ. The surface tension of the liquid be S.
Weight of liquid column acting downwards = m g
W = ρ (πD²/4) h g --(1)
The surface on the top liquid inside the capillary tube has a trough (cup) like shape. Assume the angle of contact with the walls be Ф. Surface tension is the contact force per unit length along the circumference of top surface. This force pulls the liquid vertically upwards.
Force upwards = S * πD * CosФ ----- (2)
=> h = 4 S CosФ / (ρ D g)
Posted by Amitesh Raj 6 years, 8 months ago
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Posted by Yogitha Srinivasan 6 years, 8 months ago
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Meghna Thapar 5 years, 4 months ago
Solute potential (Ψs) decreases with increasing solute concentration; a decrease in Ψs causes a decrease in the total water potential. The internal water potential of a plant cell is more negative than pure water; this causes water to move from the soil into plant roots via osmosis. Osmotic potential is directly proportional to the solute concentration. If the solute concentration of a solution increases, the potential for the water in that solution to undergo osmosis decreases. ... If no physical pressure is applied to a solution, then the solute potential is equal to the water potential.
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Aman Aman 6 years, 8 months ago
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