Advertisements
Advertisements
Question
Predict the major product of acid catalysed dehydration of butan-1-ol.
Advertisements
Solution 1
Acid catalysed dehydration of butan-1-ol produces but-2-ene as the main product and butan-1-ene as the secondary product. This is because dehydration of alcohols takes place through carbocation intermediates. Again, butan-1-ol being a 1° alcohol, on protonation and elimination of H2O, first gives a 1° carbocation (I), which being less stable rearranges to form more stable 2° carbocation (II), then it removes a proton in two different ways to form butan-2-ene or butan-1-ene. Since butan-2-ene is more stable, it is the main product according to Setzeff rule.
Solution 2
\[\ce{CH3 - CH2 - CH2 - CH2 - OH ->[H+/\Delta] \underset{But-2-ene}{CH3 - CH = CH - CH3}}\]
APPEARS IN
RELATED QUESTIONS
How will you convert: Propene to Propan-2-ol?
Name the reagents used in the following reactions:
Show how is the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal?
\[\begin{array}{cc}
\ce{CH3 - CH - CH2OH}\\
|\phantom{........}\\
\ce{CH3}\phantom{....}\\
\end{array}\]
Show how is the following alcohol prepared by the reaction of a suitable Grignard reagent on methanal?
Predict the major product of acid catalysed dehydration of 1-methylcyclohexanol.
What is meant by hydroboration-oxidation reaction? Illustrate it with an example.
Write the mechanism of hydration of ethene to yield ethanol.
How is the following conversion carried out?
\[\ce{Ethyl magnesium chloride -> Propan-1-ol}\]
Name the reagent used in the following reaction:
Dehydration of propan-2-ol to propene.
Name the reagent used in the following reaction:
Butan-2-one to butan-2-ol.
Show how you would synthesise the following alcohol from an appropriate alkene?
Benzaldehyde differs from acetaldehyde in that:
Glycerol as a trimester present in
The products "A" and "B" formed in above reactions are:
\[\ce{C3H8O ->[{[O]}][K2Cr2O7/H2SO4] C3H6O ->[I2 + NaOH(aq.)] CHI3}\]
In this reaction the first compound is:
For distinction between \[\ce{CH3CHO}\] and \[\ce{C6H5CHO}\] the reagent used is ______.
The major product of the following reaction is:
\[\begin{array}{cc}
\ce{Cl}\phantom{.........................}\\
|\phantom{..........................}\\
\ce{CH3 - CH - CH3 ->[(i) Alc. KOH][(ii) HBr/peroxide (iii) aq. KOH]}
\end{array}\]
Ceric aminonium nitrate and CHCl3/alc. KOH are used for the identification of functional groups present in ______ and ______ respectively.
How are the following conversion carried out?
\[\ce{Methyl magnesium bromide -> 2-Methylpropan-2-ol}\]
