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Allylic halide is...

Allylic halide is

A

compound in which halogen atom is bonded to `sp^3` hybridised carbon atom next to aromatic ring

B

compound in which halogen atom is bonded to `sp^3` hybridised carbon atom next to carbon-carbon double band

C

compound in which halogen atom is bonded to an alkyl group

D

None of the above

Text Solution

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The correct Answer is:
To understand what an allylic halide is, let's break down the definition and characteristics step by step. ### Step-by-Step Solution: 1. **Definition of Allylic Halide**: - An allylic halide is defined as a compound in which a halogen atom (X) is bonded to a carbon atom that is adjacent to a carbon-carbon double bond (C=C). 2. **Structure of Allylic Halide**: - The carbon atom to which the halogen is attached is typically sp³ hybridized. This means it is connected to four other atoms (or groups) with single bonds. - The adjacent carbon atom involved in the double bond is sp² hybridized. 3. **Examples**: - Consider a simple structure: CH2=CH-CH2X. Here, the halogen (X) is attached to the CH2 group, which is adjacent to the double bond (C=C). This is an allylic halide. - Another example could be a cyclic compound with a double bond, such as a cyclohexene derivative where a halogen is attached to a carbon adjacent to the double bond. 4. **Identifying Allylic Halides**: - When looking at a molecular structure, identify the double bond first. Then, check the carbon atoms adjacent to this double bond. If any of these sp³ hybridized carbons have a halogen attached, it qualifies as an allylic halide. 5. **Options Analysis**: - **Option 1**: Incorrect, as it describes a halogen bonded to a carbon next to an aromatic ring, which does not define allylic halides. - **Option 2**: Correct, as it accurately describes a halogen bonded to an sp³ hybridized carbon adjacent to a carbon double bond. - **Option 3**: Incorrect, as it does not specify the requirement of adjacency to a double bond. - **Option 4**: Incorrect, since option 2 is the correct definition. ### Conclusion: The correct definition of an allylic halide is given in **Option 2**: "A compound in which a halogen atom is bonded to an sp³ hybridized carbon atom next to a carbon double bond."
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Vinylic halides,allylic halides and Benzylic halides.

How many of the following compounds can be categorized as allylic halides? 3-Chloropropene, 3 - bromocyclohexene, benzyl chloride, 4-iodopent -2 - ene, bromobenzene, (1-chloroethyl)benzene, 4-chlorocyclopentene, 1-chiorabut -1-ene, 1-chlorobut -2-ene

Knowledge Check

  • Assertion: Primary allylic halides show higher reactivity in S_(N^(1)) reactions than other primary alkyl halides. ltBrgt Reason: Intermediate carbocation in allyl halides is stabilised by resonance.

    A
    If both assertion and reason are correct and reason is correct explanation for assertion
    B
    If both assertion and reason are correct but reason is not correct explanation for assertion.
    C
    If assertion is correct but reason is incorrect.
    D
    if both assertion and reason are incorrect.
  • Which of the following is not a an allylic halide ?

    A
    4-Bromopent-2-ene
    B
    3-Bromo-2-methylbut-1-ene
    C
    4-Bromobut-1-ene
    D
    3-Bromo-2-methylpropene.
  • Which of the following is allylic halide ?

    A
    Benzyl chloride
    B
    (1-Bromoethyl )benzene
    C
    1-Bromobenzene
    D
    3-Chlorocyclohex-1-ene
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    1^@ allylic halides are more reactive than 1^@ RX in SN^1 reaction. Allylic carbocation intermediate is stabilished by resonance.

    Velocity of the S_(N^(2)) reaction depends on the concentration of the substrate as well as te nucleophile. The reaction is favoured by strong Nu^(overset(..)(ө)) , and in the presence of polar aprotic solvent, optically active halides give walden inversion by S_(N^(2)) mechanism. the presence of hetro group (atom as beta-C atom, unsaturation at beta-C , and (-overset(O)overset(||)(C)-) Allyl halides also give S_(N^(2)) mechanism. EDG at ortho-and para-positions in benzyl halides favours S_(N^(1)) mechanism, whereas EWG favours S_(N^(2)) mechanism. Q. Which of the following will give S_(N^(2)) mechanism

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    Which of the following is not an allylic halide?