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प्रश्न
\[\ce{CH3 - CH = CH2 ->[HI][Peroxide]}\]
The major product of the above reaction is,
विकल्प
\[\ce{I - CH2 - CH = CH2}\]
\[\ce{CH3 - CH2 - CH2I}\]
\[\begin{array}{cc}
\ce{CH3-CH-CH3}\\
|\\
\ce{I}\end{array}\]\[\begin{array}{cc}
\ce{CH3-CH-CH2}\\
\phantom{.....}|\phantom{.....}|\\
\phantom{.......}\ce{I}\phantom{....}\ce{OH}
\end{array}\]
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उत्तर
\[\begin{array}{cc}
\ce{CH3-CH-CH3}\\
|\\
\ce{I}\end{array}\]
Explanation:
Identify the effect of peroxide
-
The peroxide (anti-Markovnikov) or Kharasch effect occurs only with HBr.
-
It does not occur with HCl or HI, because the free-radical mechanism is not energetically favorable for these acids.
With HI, the reaction follows the normal (Markovnikov) addition rule, not the peroxide effect.
Hydrogen (H) attaches to the carbon having more hydrogens, and iodine (I) attaches to the more substituted carbon of the double bond.
\[\ce{CH 3 - CH = CH 2 + HI -> CH 3 - CHI - CH 3}\]
This compound is 2-iodopropane.
Reason: Peroxide effect does not operate with HI, so normal (Markovnikov) addition occurs.
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संबंधित प्रश्न
The correct order of increasing reactivity of C-X bond towards nucleophile in the following compounds is:
(I)
(II)
(III) (CH3)3 C-X
(IV) (CH3)2 CH-X
Choose the most correct option.
The best method for the preparation of alkyl fluorides is _______.
Choose the most correct option.
Which of the following is likely to undergo racemization during alkaline hydrolysis?
(I)
\[\begin{array}{cc}
\ce{CH3-CH-C2H5}\\
|\\
\ce{Cl}\end{array}\]
(II)
(III)
(IV)
\[\begin{array}{cc}
\ce{\phantom{.......}CH3}\\
\phantom{.....}|\\
\ce{CH3-CH}\\
\phantom{.....}|\\
\ce{\phantom{..........}CH2Cl}
\end{array}\]
The type of mono halogen derivative in which a halogen atom is bonded to sp3 hybridized carbon atom next to carbon-carbon double bond is ______________
The common name of 1-chloro-2, 2-dimethyl propane is ______.
The bond line formula of 1-iodo-2, 3-dimethyl pentane is
When propene reacts with HCl in presence of peroxide, the product is ________.
IUPAC name of isobutyl chloride is ______.
The number of possible monohalogen derivatives for the alkyl halide having molecular formula C4H9X is ____________.
Identify 'B' in the following series of reactions.
\[\ce{Ethanol ->[NaBr][H2SO4, \Delta] A ->[Mg][Dry ether] B}\]
What is the IUPAC name of neopentyl chloride?
How many asymmetric carbon atoms are present in neopentyl chloride?
Identify A and B respectively in the following conversion.
\[\ce{Ethene ->[A] Bromoethane ->[B][\Delta] Ethyl propionate}\]
The decreasing order of the rate of nitration of benzene (I), C6D6 (II), nitrobenzene (III), chlorobenzene (IV) is ______.
The allylic halide, among the following, is ______.
Identify the chiral molecule from the following.
Identify A and B:
\[\ce{C6H5CH2Br ->[Alc.][KCN] A ->[Na/Ethanol] B}\]
Identify the chiral molecule from the following.
Name the following halide according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
\[\ce{CH3C(C2H5)2CH2Br}\]
