All About Benzene by Neceth Olairo https://padlet.com/necetholario/ei8rmlspzv6 Includes Kekule's model of benzene, structure of benzene and naming benzene derivatives, exam-type questions on Benzene with model answers from the mark scheme. en-us 2014-04-23 12:49:08 UTC 2025-12-01 20:44:09 UTC hello@padlet.com http://d20uo2axdbh83k.cloudfront.net/20140423/c9f07cbd0d3b3b58f7ff6ae769aa4353.jpg Kekule's structure necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26482003 -problems with the structure and how it differs from the actual structure of benzene

]]> 2014-04-23 13:10:38 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26482003 Benzene Derivatives Introduction necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26482361 -lesson on how to draw and name Benzene derivatives

]]> 2014-04-23 13:14:33 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26482361 Naming Aromatic Compounds necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26482758 -includes background information on the structure of Benzene and how to correctly draw aromatic compounds.

]]> 2014-04-23 13:18:49 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26482758 Exam-type question about the delocalised model of Benzene necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26484267 -includes model answers based on the mark scheme

1) Discuss the features of the delocalised model of benzene. You can include drawings. (5 marks)

Model Answer:

-Benzene is a CYCLIC HYDROCARBON with six carbon atoms and six hydrogen atoms

-The six carbon atoms are arranged in a PLANAR HEXAGONAL RING.

-The shape around each carbon atom is TRIGONAL PLANAR with BOND ANGLE OF 120 DEGREES.

-Each carbon atoms has three outer-shell electrons bonded to two carbon atoms and one hydrogen atom. These are called SIGMA BONDS.

-This leaves a fourth outer-shell electron in the p-orbital to overlap with the other electron in the p-orbital on either side. This creates a system of PI-BONDS that SPREAD over the ring of electron density above and below the ring.

-The electrons are said to be DELOCALISED.

-Illustrations:

]]> 2014-04-23 13:31:24 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26484267 Exam-type question about Kekule's structure necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26563902 -includes model answers based on the mark scheme

Discuss the reasons why Kekule's structure is considered to be a false representation of Benzene's structure. (3 marks)

- The enthalpy of hydrogenation of Benzene is less exothermic than expected.

-The bond length in Benzene is longer than C=C and shorter than C-C.

-Benzene does not take part in electrophilic addition.

-Benzene does not decolourise Bromine.

]]> 2014-04-24 10:40:05 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26563902 How Pi-bonding in Benzene occurs necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26564240 -explanation on the formation of pi-bonds in Benzene

]]> 2014-04-24 10:46:10 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26564240 More on Naming Aromatic Compounds necetholario https://padlet.com/necetholario/ei8rmlspzv6/wish/26564718 -includes summary of steps to follow in naming aromatic compounds and questions. (Just click on "Source" to take the quiz).

]]> 2014-04-24 10:56:22 UTC https://padlet.com/necetholario/ei8rmlspzv6/wish/26564718