CBSE
Multiple Choice QuestionsAssertion : 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.
The length of C - C bond in benzene is :
1.22 Ao
1.54 Ao
1.39 Ao
1.56 Ao
Which of the following is most stable ?
1-butene
1-pentene
2-butene
2-pentene
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.
Among the following the aromatic compound is
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.
The compound having only primary hydrogen atoms is
isobutene
2,3-dimethylbutene
cyclohexane
propyne
Which ofthe following is most stable carbocation?
CH3+
CH3CH2H2
CH3HCH3
CH3-(CH3)-CH3
Which of the following is aromatic?
The strongest base among the following is
