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Alkenes

Gbogbo ọrọ náà

Alkenes are the reactive cousins of alkanes. Their defining feature - a carbon-carbon double bond - makes them unsaturated and opens the door to addition reactions that alkanes simply cannot undergo.

In this lesson you will learn the general formula for alkenes, how to draw their structural and displayed formulae for up to four carbon atoms, why the C=C functional group makes them unsaturated, and how to use bromine water as a simple test to tell alkenes and alkanes apart.

Ebumnobi

Know that alkenes contain the functional group C=C
Know the general formula for alkenes
Explain why alkenes are classified as unsaturated hydrocarbons
Understand how to draw the structural and displayed formulae for alkenes with up to four carbon atoms
Describe the reactions of alkenes with bromine to produce dibromoalkanes
Describe how bromine water can be used to distinguish between an alkane and an alkene

Akọmọ Ojú-ẹkọ

Swap one single bond for a double bond and the entire chemistry changes. Alkenes are far more reactive than alkanes, which is why they serve as the starting point for making polymers, alcohols and a huge range of industrial chemicals.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Alkenes. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

The general formula for alkenes is: A) CnH2n+2 B) CnH2n C) CnH2n-2 D) CnHn Answer: B
Alkenes are described as unsaturated because they contain: A) Only single bonds B) A carbon-carbon double bond C) A carbon-oxygen bond D) An OH group Answer: B
When ethene reacts with bromine, the reaction type is: A) Substitution B) Combustion C) Addition D) Decomposition Answer: C
Bromine water is decolorised by: A) Methane B) Propane C) Butane D) Ethene Answer: D
Which is the simplest alkene? A) Methene B) Ethene C) Propene D) Butene Answer: B