Assertion : Styrene on reaction with HBr gives 2-bromo-2-phenyl ethane.
Reason: Benzyl radical is more stable than alkyl radical.
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 resason is true but assertion is false
If both assertion and reason are false.
Assertion : The pKa of acetic acid is lower than that of phenol.
Reason : Phenoxide ion is more 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.
Assertion : Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true and the reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
B.
If both assertion and reason are true and the reason is not the correct explanation of the assertion.
The monoalkyl derivative first formed readily undergoes further alkylation at a still greater speed to produce polysubstituted products, and alkyl halide employed may also undergo an isomeric change. Due to these difficulties alkyl benzene is not generally prepared by Friedel-Craft's alkylation of benzene.
Rate determining step in nitration of benzene is
formation of NO2+
formation of carbocation
replacement of H atom
none of these.
1,4-dimethylbenzene on heating with anhydrous AlCl3 and HCl produces
1, 2-dimethylbenzene
1, 3-dimethylbenzene
1, 2, 3-trimethylbenzene
ethylbenzene
In 2-butene, which one of the following statements is true?
C1-C2 bond is sp3-sp3 --bond
C2-C3 bond is sp3-sp2 --bond
C1-C2 bond is an sp3-sp2 --bond
C1-C2 bond is an sp2-sp2 --bond
The stability of Me2C=CH2 is more than that of MeCH2CH=CH2 due to:
inductive effect of the Me groups
resonance effect of the Me groups
hyperconjugation effect of the Me groups
resonance as well as the inductive effect of the Me groups