Question

How will you obtain butan-2-ol from butan-2-ene

Answer 1

Answer:

Conversion of :-

⇒ But-2-ol from But-2-ene

Step (i)

Addition reaction with HBr (Anti-Markovnikov rule)

$\sf CH_3-CH=CH-CH_3+HBr \longrightarrow CH_3-CH(H)-CH(Br)-CH_3\\(But-2-ene)\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\; ( 2-Bromo-butane)$

Step (ii)

Treatment with aqueous KOH(Potassium Hydroxide)

$\sf CH_3-CH(H)-CH(Br)-CH_3 +aq.KOH \longrightarrow CH_3-CH_2-CH(OH)-CH_3\\(2-Bromobutane)\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\; \;\;(Butan-2-ol)$

Additional Information:

• Anti - Markovnikov rule states that substituent is bonded to a less substituted carbon, than the more substituted carbon.
• Butan-2-ol has Alcohol as it's Functional Group.
• Alcohols contain the hydroxyl functional group (-OH)
• Bonded to a Carbon (C) atom of alkyl group.