✓ Board-verified
Chemistry · 2026 · 3 marks
Haloalkanes and HaloarenesPhysical Properties of Haloalkanes and Haloarenes3 marksUnderstandshort answer
CBSE 2026 · Region 3 · Set 2 · Q22
Give reasons for the following: (a) Alkyl halides, though polar, yet their solubility in water is very low. (b) p-Dichlorobenzene has higher melting…
Give reasons for the following :
(a)
Alkyl halides, though polar, yet their solubility in water is very low.
(b)
p-Dichlorobenzene has higher melting point than those of o- and m-isomers.
(c)
$\displaystyle \mathrm{CH}_{3}-\mathrm{I}$ is more reactive than $\displaystyle \mathrm{CH}_{3}-\mathrm{Br}$ towards $\displaystyle \mathrm{S}_{\mathrm{N}} 2$ reactions.
Marking-scheme solution
(a)
Less energy is released when new attractions are set up between the
haloalkane and the water molecules as these are not as strong as the
original hydrogen bonds in water. / Because of the inability of alkyl
halide to form H-bond with water.
(b)
Because of symmetry, para isomer fits well into the crystal lattice.
(c)
Because I is a better leaving group due to its larger size than Br.
All Haloalkanes and Haloarenes questions2026 question paperNCERT solutions: Haloalkanes and HaloarenesPractice Haloalkanes and Haloarenes →
More from Haloalkanes and Haloarenes
- Why haloarenes are not reactive towards nucleophilic substitution reaction? Give two reasons.2023
- Account for the following: 1 × 3 Haloalkanes react with NaCN to form both cyanides and isocyanides. Haloarenes do not undergo nucleophilic…2024
- Reaction of 1-phenyl-2-chloropropane with alcoholic KOH gives mainly:2023
- The species that attacks benzene in following is:2023
- Write the major product in the following reactions: 1+1+1 Define Racemic mixture. p-dichlorobenzene has a higher melting point as compared to its…2026
- In the following pair of compounds, which compound undergoes S_N 1 reaction faster and why? OR Write the major product in the following:2024
- Write the IUPAC name of the given compound: Why are haloalkanes more reactive towards nucleophilic substitution reactions than haloarenes? What…2024
- Assertion: Bromination of benzoic acid gives m-bromobenzoic acid. Reason (R): Carboxyl group increases the electron density at the meta position.2023
CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.