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MHT CET 202623 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
23 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

MHT CET 2026 · 23 April · Morning Shift · Chemistry · Alcohols Phenols and Ethers

Which of following reagents convert propene to 1-propanol?

Which of following reagents convert propene to 1-propanol?

Options

  1. AKOH,KMnO4\text{KOH}, \text{KMnO}_4
  2. BH2O,H2SO4\text{H}_2\text{O}, \text{H}_2\text{SO}_4
  3. CMgSO4,NaBH4,H2O\text{MgSO}_4, \text{NaBH}_4, \text{H}_2\text{O}
  4. DB2H6,H2O2,OH−\text{B}_2\text{H}_6, \text{H}_2\text{O}_2, \text{OH}^-

Correct answer

D. B2H6,H2O2,OH−\text{B}_2\text{H}_6, \text{H}_2\text{O}_2, \text{OH}^-

Step-by-step solution

Propene is CH3−CH=CH2CH_3-CH=CH_2.

Conversion of propene to 1-propanol (CH_3-CH_2-CH_2OH)involvestheanti−Markovnikovadditionofwateracrossthedoublebond.<br><br>Hydroboration−oxidationisthestandardmethodforanti−Markovnikovhydrationofalkenes.<br><br>Thereagentsusedarediborane(B2H6) involves the anti-Markovnikov addition of water across the double bond.<br><br>Hydroboration-oxidation is the standard method for anti-Markovnikov hydration of alkenes.<br><br>The reagents used are diborane (B_2H_6) followed by hydrogen peroxide (H_2O_2)inanalkalinemedium(OH−) in an alkaline medium (OH^-).

Reaction:
3CH3−CH=CH2+12B2H6→(CH3−CH2−CH2)3B3CH_3-CH=CH_2 + \dfrac{1}{2}B_2H_6 \rightarrow (CH_3-CH_2-CH_2)_3B

(CH3−CH2−CH2)3B+3H2O2→OH−3CH3−CH2−CH2OH+H3BO3(CH_3-CH_2-CH_2)_3B + 3H_2O_2 \xrightarrow{OH^-} 3CH_3-CH_2-CH_2OH + H_3BO_3

Acid-catalyzed hydration (H_2O, H_2SO_4)yields2−propanol(Markovnikovaddition).<br><br>Coldalkaline) yields 2-propanol (Markovnikov addition).<br><br>Cold alkalineKMnO_4yieldspropane−1,2−diol.<br><br>Therefore,yields propane-1,2-diol.<br><br>Therefore,B_2H_6, H_2O_2, OH^-isthecorrectreagent.<br><br>Answer:B2H6,H2O2,OH−is the correct reagent.<br><br>Answer: \text{B}_2\text{H}_6, \text{H}_2\text{O}_2, \text{OH}^-
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