Advertisements
Advertisements
प्रश्न
Predict all the alkenes that would be formed by dehydrohalogenation of the following halide with sodium ethoxide in ethanol and identify the major alkene:
2-Chloro-2-methylbutane
उत्तर
2-Chloro-2-methylbutane has two different sets of equivalent β-hydrogens so that it will give 2 alkenes.
\[\begin{array}{cc}
\ce{\overset{β}{C}H3}\phantom{.................................}\ce{CH3}\phantom{..................}\ce{CH3}\phantom{..}\\
\phantom{}|\phantom{....................................}|\phantom{......................}|\phantom{....}\\
\ce{\overset{β}{C}H3 - C - \overset{β}{C}H2CH3 ->[C2H5ONa/C2H5OH][-HCl] \underset{2-Methylbut-1-ene}{CH2 = C - CH2CH3} + \underset{2-Methylbut-2-ene}{CH3 - C = CHCH3}}\\
|\phantom{...............................................................}\\
\ce{\underset{2-Chloro-2-methylbutane}{Cl}}\phantom{..............................................................}
\end{array}\]
Since the more substituted alkene will be more stable, 2-methylbut-2-ene will be the major alkene.
APPEARS IN
संबंधित प्रश्न
Identify ‘A’ and ‘B’ in the following reaction :
\[\ce{CH3 - CH = CH2 ->[HBr]'A' ->[alc.KOH]'B'}\]
Predict all the alkenes that would be formed by dehydrohalogenation of the following halide with sodium ethoxide in ethanol and identify the major alkene:
1-Bromo-1-methylcyclohexane
Predict all the alkenes that would be formed by dehydrohalogenation of the following halide with sodium ethoxide in ethanol and identify the major alkene:
2, 2, 3-Trimethyl-3-bromopentane
How will you bring about the following conversion?
But-1-ene to but-2-ene
Write the structure of the major organic product in the following reaction:
\[\ce{(CH3)3CBr + KOH ->[ethanol][heat]}\]
How the following conversion can be carried out?
1-Bromopropane to 2-bromopropane
How the following conversion can be carried out?
2-Chloropropane to 1-propanol
How the following conversion can be carried out?
2-Bromopropane to 1-bromopropane
What are racemates?
Observe the following compounds and answer the questions given below.
(I)
\[\ce{\underset{\text{(II)}}{CH3 - CH2 - Br}}\]
- Identify the type of halides.
- Explain the nature of the C – Br bond in both of these halides.
- Which of these compounds will undergo aqueous alkaline hydrolysis readily? Write the reaction in support of your answer.
'A' is:
Deamination of meso- di bromobutane gives mainly:-
Elimination of bromine from 2-bromobutane results in the formation of ______.
The conversion of an alkyl halide into an alkene by alcoholic KOH is classified as ______.
Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
\[\ce{CH3 C(CI) (C2H5)CH2CH3 }\]
