CBSE 2025 · Region 7 · Set 1 · Q25 · 3 marks
A compound (A) with molecular formula $\displaystyle \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{I}$ which is a primary alkyl halide, reacts with alcoholic KOH to give compound (B). Compound (B) reacts with HI to give (C) which is an isomer of (A). When (A) reacts with Na metal in the presence of dry ether, it gives a compound (D), $\displaystyle \mathrm{C}_{8} \mathrm{H}_{18}$, which is different from the compound formed when n-butyl iodide reacts with sodium. Write the structures of (A), (B), (C) and (D). Write the chemical equation when compound (A) is reacted with alcoholic KOH.
Marking-scheme solution
A=
B=
C=
D=
$\displaystyle +\ \mathrm{KI}\ +\ \mathrm{H_2O}$
B=C=D= $\displaystyle +\ \mathrm{KI}\ +\ \mathrm{H_2O}$Haloalkanes and HaloarenesMethods of Preparation of HaloalkanesAnalyseshort_answerhard
More from Haloalkanes and Haloarenes
- Reaction of 1-phenyl-2-chloropropane with alcoholic KOH gives mainly:2023 · asked 3×
- An alkyl halide of molecular formula C 6 H 13 Cl on treatment with alcoholic KOH gives two isomeric alkenes…2023 · asked 3×
- Assertion: The boiling points of alkyl halides decrease in the order RI RBr RCl RF. Reason (R): The van der…2025 · asked 3×
- Define the following: 2+1=3 (i) Enantiomers (ii) Racemic mixture Why is chlorobenzene resistant to…2025 · asked 3×
- Assertion: n-Butyl chloride has higher boiling point than n-Butyl bromide. Reason (R): C - Cl bond is more…2025 · asked 3×
- Write any two differences between S N 1 and S N 2 reactions. Which of the following compounds would undergo S…2025 · asked 3×
- Account for the following: Benzyl chloride is highly reactive towards S N 1 reaction. (±)-Butan-2-ol is…2023 · asked 3×
- Why are haloarenes less reactive towards nucleophilic substitution reaction? How does the presence of nitro…2025 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.