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Assertion (A) Addition reaction of water...

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.

A

Assertion and reason both are correct and reason is correct explanation of assertion.

B

Assertion and reason both are wrong statements.

C

Assertion is correct statement but reason is wrong statement.

D

Assertion is wrong statement but reason is correct statement.

Text Solution

Verified by Experts

The correct Answer is:
b

Assertion and reason both arw wrong statements.
Correct Assertion Addition reactio of water to but-1-ene in acidic medium yields butan-2-ol.
Correct Reason Addition of water in acidic medium proceeds through the formation of secondary carbocation.
Mechanism `H_(2)O+H^(+) rarr H_(3)O^(+)`
`CH_(3)-CH_(2)-CH=CH_(2)+H underset(":")overset(":")(O_(+))-H rarr H_(3)C-underset((2^(@) "carbocation"))(CH_(2)-overset(+)(CH)-CH_(3))+H_(2)O`
`{:(H_(3)-CH_(2)-overset(+)(CH)-CH_(3)+H_(2)O rarr H_(3)C-CH_(2)-CH-CH_(3)),(" |"),(" "+:O-H),(" |"),(" "H):}`
`H_(3)C-CH_(2)-overset(CH_(3))overset(|)(CH_(2))-underset(..)overset(H)overset(|)(O)-H+H_(2)O rarr CH_(3)-underset("Butane-2-ol")(CH_(2)-overset(OH)overset(|)(CH)-CH_(3))`
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Knowledge Check

  • Assertion: Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol. Reason: Addition of water in acidic medium proceeds through the formation of primary carbocation.

    A
    Assertion and reason both are correct and reason is correct explanation of assertion.
    B
    Assertion and reason both are wrong statement.
    C
    Assertion is correct statement but reason is wrong statement.
    D
    Assertion is wrong statement but reason is correct statement.
  • Addition of HBr to but -1- ene yields

    A
    `2-`bromobutane
    B
    `(+)-2-`bromobutane
    C
    `(-)-2-`bromobutane
    D
    `(+-)-2-`bromobutane
  • The addition of HBr to but-1-ene in the presence of dibenzoyl peroxide yields

    A
    `(+-)-2-`bromobutane
    B
    `1-`bromobutane
    C
    `(+-) 1-`bromobutane
    D
    `2-`bromobutane
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    Assertion: Addition of Br_(2) to trans but-2-ene yields meso- 2,3-dibromobutane. Reason : Bromine addition to an alkene is an electrophilic addition reaction.