AIIMS Chemistry Haloalkanes and Haloarenes Class 12 Questions
28 questions
Assertion: $\text{CH}_3 - \underset{\substack{| \\ \text{CH}_3}}{\overset{\substack{\text{CH}_3 \\ |}}{\text{C}}} - \text{O} - \text{CH}_3$ React with HBr to form $(\text{CH}_3)_3\text{CBr}$ and $\text{CH}_3\text{OH}$ Reason: It follows SN1 mechanism
Product is:
Correct order for reaction with alcoholic KOH
Which will release $\text{NH}_3$ on Reaction with $\text{NaOH}$
What is X in the following reaction?
Find product of given reaction :
Which colour is observed when ZnO is heated?
Assertion: β-dehydrohalogenation of alkyl halides is anti elimination in which bond breaking and bond forming occur simultaneously. Reason: β-Dehydrohalogenation of alkyl halides gives Saytzeff product.
In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice. Assertion (A) Aryl halides undergo nucleophilic substitution with ease. Reason (R) Hybridisation of C-atom attached to halide is $\text{sp}^{3}$ − hybrid.
Assertion Treatment of chloroethane with a saturated solution of AgCN gives ethyl isocyanide as the major product. Reason Cyanide (CN–) is an ambident nucleophile.
A is
HI (excess) Δ
Best method to form aromatic iodide is
Sn₂ reaction readily occurs in
Assertion : CH₃-C≡CH₂-Br + NaOH → CH₃-C≡CH₂-CH₂-OH Reason : It follows with formation of more stable carbocation.
In solvents like DMSO, acetonitrile, F⁻ ion of dissolved NaF is more reactive than in methyl alcohol. Explain
Assertion : C₂H₅Br reacts with alcoholic solution of AgNO₂ to form nitroethane as the major product. Reason : NO₂⁻ is an ambident ion.
Which of these compounds is synthesised by chloral?
Assertion : Alkyl iodide can be prepared by treating alkyl chloride/bromide with NaI in acetone. Reason : NaCl/NaBr are soluble in acetone while NaI is not.
The correct increasing order of the reactivity of halides for Sₙ1 reaction is
The major product obtained on treatment of CH₃CH₂CH(Br)CH₃ with CH₃O⁻/CH₃OH is
³⁻Phenylpropene on reaction with HBr gives (as a major product)
Among the following the most reactive towards alcoholic KOH is
o-Toluic acid on reaction with Br₂ + Fe gives
Which of the following are arranged in the decreasing order of dipole moment?
Assertion : Benzyl bromide when kept in acetone water it produces benzyl alcohol. Reason : The reaction follows Sₙ2 mechanism.
Assertion : Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene. Reason : Alkyl halides are less reactive than acyl halides.
Which of the following is stable (inert) to fire?