What is the order of reactivity of halogen acids?
HI > HBr > HCl.
What happens when alcohol reacts with halogen acid?
When treated with HBr or HCl alcohols typically undergo a nucleophilic substitution reaction to generate an alkyl halide and water. Alcohol relative reactivity order : 3o > 2o > 1o > methyl. … Methanol and primary alcohols will proceed via an SN2 mechanism since these have highly unfavourable carbocations.
Which is more reactive primary or secondary alcohol?
Alcohol has a hydrogen atom attached to the oxygen atom. … Therefore, as the alkyl groups on carbon connected to the alcohol functional group increases, thereby decreasing the acidic strength of alcohol. From this, we conclude that the reactivity of alcohol with sodium will be primary > secondary > tertiary.
What is the order of reactivity of HCl HBr Hi with alcohol and why?
When treated with HBr or HCl alcohols typically undergo a nucleophilic substitution reaction to generate an alkyl halide and water. Alcohol relative reactivity order : 3o > 2o > 1o > methyl. Hydrogen halide reactivity order : HI > HBr > HCl > HF (paralleling acidity order).
Why HI is most reactive towards alcohol?
Answer: HI has the lowest bond dissociation energy due to longer bond length that’s why it is most reactive.
Why HI is more reactive than HCl?
The same reasoning applies for both HBr and HI. These acids are even stronger than HCl because the Br– and I– ions are even larger. As such, the H-Br and H-I bonds are even weaker, and these compounds also readily dissociate in solution.
Why HCl is less reactive towards alcohol?
Because the chloride ion is a weaker nucleophile than bromide or iodide ions, hydrogen chloride does not react with primary or secondary alcohols unless zinc chloride or a similar Lewis acid is added to the reaction mixture as well.
Is HCl or H Br more reactive?
Most people say that it is because the 3p orbital of chlorine when overlapping with the s orbital of hydrogen covers more area than when 4p orbital of bromine overlaps with the s orbital of hydrogen which makes bond between H and Cl more stronger than the bond between H and Br.
Why do tertiary alcohols react faster with HCl?
Tertiary alcohols are more reactive because the increased number of alkyl groups increases +I effect. So, the charge density on carbon atom increases and hence around oxygen atom.
Is HBr SN1 or SN2?
Primary, secondary, and tertiary alcohols all undergo nucleophilic substitution reactions with HI, HBr, and HCl to form alkyl halides. The mechanism of the substitution reaction depends on the structure of the alcohol. Secondary and tertiary alcohols undergo SN1 reactions.