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What pie and sigma bond in Organic Chemistry

Pie and Sigma bond _Carbon and ItsCompound The sigma bond is a bond formed by head to head overlap of orbitals. In sigma bonds the electron density is concentrated in between the two atoms. The   sigma bond in a molecule is denoted by a single bond . Hence in a molecule, all the single bonds are sigma bonds. For example in ethane (CH 3 -CH 3 ), there are seven single bonds. So, there are seven sigma bonds in ethane (six C-H and one C-C). Thus saturated hydrocarbons possess only sigma bonds. The formation of sigma bonds is shown below Pie bond is formed by the sideways overlapping of orbitals. In pie bonds, the electron density also concentrates between the atoms, but on either side of the line joining the two atoms. the shape of the molecule is determined by the sigma bonds but not by the pie bonds. Pie bond in fact shortens the bond length. A double bond is made up of one sigma bond and one pie bond. A triple bond is made up of one sigma bond and two pie bonds. Thus the

Odisha Board HSC Sample Paper, 2014

Board of Secondary Education, Odisha  Sample Paper, 2014 Sample Papers HSC EXAM 2014  Odisha Board HSC Sample Paper, 2014 - Social Science Odisha Board HSC Sample Paper, 2014 - General Science Odisha Board HSC Sample Paper, 2014 - Mathematics Odisha Board HSC Sample Paper, 2014 - Hindi Odisha Board HSC Sample Paper, 2014 - Sanskrit Odisha Board HSC Sample Paper, 2014 - English (Notice) CBSE : Board Examination 2014 of Class X/XII will start from 1st March 2014 Title Part - I OMR Part - II MIL-Odia   odia Part 1.pdf   omr-odia.pdf   odia Part 2.pdf English   english part 1 -2014.pdf   omr-eng.pdf   english part 2 -2014.pdf Sanskrit   Sanskrit part 1.pdf   omr-sans.pdf   Sanskrit part 2.pdf Hindi   hindi-i.pdf   omr-tlh.pdf   hindi-ii.pdf Mathmatics   Mathmatics part 1.pdf   omr-math.pdf   Mathmatics part 2.pdf Gene

CBSE_NCERT Class Xth Topic _Properties of Alkanes/ Alkenes/ Alkynes

Properties of Alkanes/ Alkenes/ Alkynes   (10 th Carbon and its compounds) Properties of Alkanes/ Alkenes/ Alkynes (a) Alkanes are gas (C 1 to C 4 ) ; liquid (C 5 to C 17 ) and rest are solid at room temperature. (b) The melting and boiling point of Alkanes increases with increase in number of C – atom in Alkanes. Alkane Formula Boiling point [°C] Melting point [°C] State (at 20 °C) Methane CH 4 -162 -182 gas Ethane C 2 H 6 -89 -183 gas Propane C 3 H 8 -42 -188 gas Butane C 4 H 10 0 -138 gas Pentane C 5 H 12 36 -130 liquid Hexane C 6 H 14 69 -95 liquid Heptane C 7 H 16 98 -91 liquid Octane C 8 H 18 126