During dehydration of alcohols to alkenes by heating with conc. H2SO4 , the initial step is :
formation of an este
protonation of alcohol molecule
formation of carbocation
elimination of water
Assertion : Phenol is more acidic than ethanol.
Reason : Phenoxide ion is resonance stabilised.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
The condensation product of reaction between phenol and phthalic anhydride :
methyl orange
salicylic acid
phenol red
phenolphthalein
The IUPAC name of is :
1 , 2 , 3 - propane tri-ol
3 - hydroxy butanoic acid
1 , 2 - ethane di-ol
3 - methyl butanol - 1
Catalytic dehydrogenation of a primary alcohol gives a :
secondary alcohol
aldehyde
ketone
ester
B.
aldehyde
Primary alcohols get dehydrogenated with reduced copper at 573 K , to give corresponding aldehydes .
+ H2
Benzoic acid is treated with lithium aluminium hydride. The compound obtained is
benzaldehyde
benzyl alcohol
toluene
benzene
During the dehydration of alcohols to alkenes by heating with conc. H2SO4 the initiating step is
elimination of water
protonation of an alcohol molecule
formation of an ester
formation of carbocation.
Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers.
Reason : Change in colour is due to complexation of alcohol with potassium dichromate.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Phenol undergoes Kolbe's reaction whereas ethanol does not.
Reason : Phenoxide ion is more basic than ethoxide ion.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.