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Elimination on haloalkanes or alcohols

Exercises

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Give the formula and name of the organic substance produced by the following elimination reaction:

Reagents:
3-chloropentane / $K^++OH^-$ concentrated

$CH_3CH=CHCH_2CH_3$ ; pent-2-ene

Reagents:
2-methylpropan-2-ol / diluted and warm sulfuric acid ($H^+$ fixes on $O-H $   in order to activate that function, then departure of $H_2O$

$CH_2=C(CH_3)_2$ ; methylpropene

Reagents:
2-iodo-2-methylpropane / ethanol warm

$CH_2=C(CH_3)_2$ ; methylpropène

Reagents:
chlorocyclohexane / $Na^++OH^- $  concentrated

cyclohexene

Reagents:
sodium methanoate / 2-bromobutane

$CH_3CH=CHCH_3$

1-bromobut-1-ene / KOH warm

$CH_3CH_2C\equiv CH$ ; but-1-yne