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Markovnikov's rule (Markovnikov addition): In an addition reaction of a protic acid HX (hydrogen chloride, hydrogen bromide, or hydrogen iodide) to an alkene or alkyne, the hydrogen atom of HX becomes bonded to the carbon atom that had the greatest number of hydrogen atoms in the starting alkene or alkyne.

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1'alkohal Difination

Posted by Vishwajeet Kumar 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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i am not study till now . but i want to study now pls tell me a time table to follow

Posted by Shubjam Singh 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Explain nylon6,6 with structure

Posted by Sourabh Saini 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Kritika Trehan 8 years, 4 months ago

Nylon comes from a family of synthetic polymers known as polyamide . It was first introduced by Wallace Carothers on 28th February 1935.Nylon 6,6 is a polyamide made by polycondensation of adipic acid methylenediamine , and contains a total of 12 carbon atoms in each repeating unit . The properties which make Polyamides suitable for plastic applications are resistance to toughness , thermal stability , good appearance , resistance to chemicals etc .The advantages of Nylon 66 are- 1.Nylon 6,6 persues excellent abrasion resistance and a high melting point .

2.Nylon 6,6 has high tensile strength and exhibits only half of shrinkage in steam .

3. It also provides a very good resistance to photo degradation .

4.Nylon 6,6 also has good advantage over industrial products because it reduces moisture sensitivity in raw products and has a high dimensional stability and melting point .

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Alchol is more soluble in water then ethanol

Posted by Jeet Singh Poonia 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Manan Kuraware 8 years, 4 months ago

Due to strong intermolecular hydrogen bonding in alchol

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Avnish Kumar 8 years, 4 months ago

Due to presence of hydrogen bond in alcohol

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What is superconductivity

Posted by Nikita Verma 8 years, 4 months ago

CBSE > Class 12 > Chemistry

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Kritika Trehan 8 years, 4 months ago

Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic flux fields occurring in certain materials, called superconductors, when cooled below a characteristic critical temperature.

Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.

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In nitration of phenol which one is major out of ortha and para-nitrophenol

Posted by Pratul Jha 8 years, 4 months ago

CBSE > Class 12 > Chemistry