Multiple Choice QuestionsAssertion: Dehydration of alcohols always takes place in basic medium.
Reason : OH- is a better leaving group.
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 : Toluene in presence of UV rays forms benzaldehyde.
Reason : Dichlorotoluene is formed as an intermediate.
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 : p-Nitrophenol gives more electrophilic substituted compound than m-methoxyphenol.
Reason : Methoxy group shows only negative I-effect.
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.
D.
If both assertion and reason are false.
In p-nitrophenol, - NO2 group has -I effect, as a result of which electron density decreases on the benzene ring, hence reactivity towards electrophilic substitution decreases. Methoxy group shows both +R (due to lone pair of electrons on O) and -I effect (due to greater electronegativity of O).
OCH3 at meta-position shows only -I effect but lesser than -I effect of -NO2 group.
Which of the following compounds would not evolve CO2 when treated with NaHCO3 solution ?
salicylic acid
Phenol
anisole
phenyl benzoate
By heating phenol with chloroform in alkali , it is converted into :
salicylic acid
salicylaldehyde
anisole
phenyl benzoate
When a mixture of calcium benzoate and calcium acetate is dry distilled , the resulting compound is :
acetophenone
benzaldehyde
benzophenone
acetaldehyde
Cumene process is the most important commercial method for the manufacture of phenol. Cumene is
iso-propyl benzene
ethyl benzene
vinyl benzene
propyl benzene.
When phenol reacts with phthalic anhydride in presence of H2SO4 and heated and hot reaction mixture is poured in NaOH solution, then product formed is
alizarin
methyl orange
fluorescein
phenolphthalein.
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