COMPASSLearning
RegisterLogin

JEE Main · 2021 · 24 Feb 2021 · Shift 1 · Alcohols Phenols and Ethers

WhatsApp Email
Which is the final product (major) 'A' in the given reaction?

  1. (A)(see structure)
  2. (B)(see structure)
  3. (C)(see structure)
    ✓ Correct
  4. (D)(see structure)

Answer: (C)

Solution

The reaction involves the addition of HCl to an alkene in the presence of peroxide. Under peroxide conditions (anti-Markovnikov addition), the chlorine adds to the less substituted carbon. However, the product shown in option (3) is a geminal dichloride (two chlorines on the same carbon), which forms when excess HCl reacts with the alkene.

The mechanism proceeds through:
  1. Initial anti-Markovnikov addition of HCl to form a chloroalkane
  2. Further reaction with HCl to form the geminal dichloride

The final product is the tertiary geminal dichloride shown in option (3), where both chlorine atoms are attached to the same carbon bearing two methyl groups.

JEE Main · 2021 · 24 Feb 2021 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Alcohols Phenols and Ethers →

More JEE Main questions on Alcohols Phenols and Ethers

  1. Given below are two statements :

    Statement I: Phenol on treatment with aq. KOH under refluxing condition, followed by acidification produces -hydroxy benzladehyde as the major product and -hydroxy benzaldehyde as the minor product.

    Statement II …
    JEE Main 2026View solution →
  2. 3,3-Dimethyl-2-butanol cannot be prepared by:
    A.
    B.
    C.
    D.
    E.
    Choose the correct answer from the options given below:
    JEE Main 2026View solution →
  3. A mixed ether ( P ), when heated with excess of hot concentrated hydrogen iodide produces two different alkyl iodides which when treated with aq. NaOH give compounds (Q) and (R). Both (Q) and (R) give yellow precipitate with NaOI. Identify the mixed ether (P):
    JEE Main 2026View solution →
  4. Consider the following two reactions A and B .
    (A) (see structure)
    (B) (see structure)

    Numerical value of [molar mass of molar mass of y ] is ______。
    JEE Main 2026View solution →
  5. From the following, how many compounds contain at least one secondary alcohol?
    JEE Main 2026View solution →
  6. Consider the following reaction sequence

    vapour density 47]
    Compound (y) develops characteristic colour with neutral solution.
    Identify the INCORRECT statement from the following for the above sequence.
    JEE Main 2026View solution →