JEE Main 20262 AprilEvening Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 2 April
- Shift
- Evening Shift
- Subject
- Chemistry
- Chapter
- Hydrocarbons
JEE Main 2026 · 2 April · Evening Shift · Chemistry · Hydrocarbons
The compound (X) on (i) on heating in the presence of anhydrous...
The compound (X) on
(i) on heating in the presence of anhydrous and HCl gas gives -dimethyl pentane
(ii) aromatization gives toluene and
(iii) cyclisation gives methyl cyclohexane
The correct name of compound (X) is:
(i) on heating in the presence of anhydrous and HCl gas gives -dimethyl pentane
(ii) aromatization gives toluene and
(iii) cyclisation gives methyl cyclohexane
The correct name of compound (X) is:
Options
- AHept-2-ene
- BHept-1,3,5-triene
- CHeptane
- DHept-2,4,6-triene
Correct answer
C. Heptane
Step-by-step solution
Compound (X) undergoes isomerization on heating with anhydrous and HCl gas to give branched-chain alkanes. The formation of -dimethylpentane (a -carbon branched alkane) indicates that (X) is a -carbon straight-chain alkane.
Aromatization of n-heptane at high temperature and pressure in the presence of oxides of V, Mo, or Cr supported over alumina gives toluene.
Cyclisation of n-heptane under similar conditions initially yields methylcyclohexane, which can further undergo dehydrogenation to form toluene.
Since all these reactions are characteristic of n-heptane, compound (X) is heptane.
Answer: Heptane
Aromatization of n-heptane at high temperature and pressure in the presence of oxides of V, Mo, or Cr supported over alumina gives toluene.
Cyclisation of n-heptane under similar conditions initially yields methylcyclohexane, which can further undergo dehydrogenation to form toluene.
Since all these reactions are characteristic of n-heptane, compound (X) is heptane.
Answer: Heptane