COMPASSLearning
RegisterLogin

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Hydrocarbons

WhatsApp Email
In the following reaction sequence the major products A and B are:
  1. (A)(see structure)
  2. (B)(see structure)
    ✓ Correct
  3. (C)(see structure)
  4. (D)(see structure)

Answer: (B)

Solution

The first step is a Friedel-Crafts acylation: the acyl chloride, activated by , substitutes onto the aromatic ring to give the aryl ketone . The second step is a Clemmensen reduction with and HCl, which strips the carbonyl down to a methylene group and yields the alkyl-substituted arene . These two structures are the major products of the sequence.

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Hydrocarbons →

More JEE Main questions on Hydrocarbons

  1. Identify A in the following reaction.
    JEE Main 2026View solution →
  2. Given below are two statements :

    Statement I : Benzene is nitrated to give nitrobenzene, which on further treatment with
    will give
    JEE Main 2026View solution →
  3. As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene?
    A. The magnitude of negative charge is more on chlorine atoms
    B. The bond has partial double bond character
    C. bond is les …
    JEE Main 2026View solution →
  4. The cycloalkane ( X ) on bromination consumes one mole of bromine per mole of ( X ) and gives the product ( Y ) in which ratio is . The percentage of bromine in the product is
    ____ %. (Nearest integer)
    (Given : Molar mass …
    JEE Main 2026View solution →
  5. The dibromo compound [P] (molecular formula: ) when heated with excess sodamide followed by treatment with dilute HCl gives [Q]. On warming [Q] with mercuric sulphate and dilute sulphuric acid yield [R] which gives positive Iodoform t …
    JEE Main 2026View solution →
  6. But-2-yne and hydrogen (one mole each) are separately treated with (i) and (ii) liq. to give the products X and Y respectively.

    Identify the incorrect statements.
    A. and are stereoisomers.
    B. Dipole moment of X …
    JEE Main 2026View solution →