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1, 2 - Dibromocyclohexane on dehydrobrom...

1, 2 - Dibromocyclohexane on dehydrobromination gives:

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Allybromide on dehydrobromination gives

Explain the stereochemistry of the products from E2 dehalogenation with I^(Θ) of the following. a. (i) Meso -2-3- dibromobutane and (ii) S,S-2,3- dibromo - butane. b. E2- dehydrobromination of (i) R,R-2,3- dibromobutane and (ii) meso -(R,S)-2,3- debromobutane c. From which conformation of bromocyclohexane in the E2 dehydrobromination is best achieved.

Which of the following molecules have zero dipole moment? (I) gauche conformation of 1, 2 - dibromoethane. (II) anti conformation of 1, 2 - dibromoethane. (III) trans - 1, 4 - dibromocyclohexane (IV) cis - 1, 4 - dibromocylohexane (V) tetrabromomethane. (VI) 1, 1- dibromocyclohexane

Which of the following molecules have non-zero dipole moments ? (I) Gauche conformation of 1, 2 -dibromoethane (II) Anti conformation 1,2-dibromorthane (III) Trans-1,4 -dibromocyclohexane (IV) Cis-1, 4-dibromocyclohexane (V) Tetrabromomethane (VI) Dibromocychexane

Which of the following molecules have non-zero dipole moments ? (I) gauche conformation of 1,2-dibromoethane (II) anti conformation of 1,2-dibromoethane (III) trans-1,4-dibromocyclohexane (IV) cis1,4-dibromocyclohexane (V) tetrabromomethane (VI) 1,1-dibromocyclexane

Knowledge Check

  • 1,2-dibromo cyclohexane on dehydrogenation gives :

    A
    B
    C
    D
    none of these

  • Allybromide on dehydrobromination gives

    A
    Propadiene
    B
    Propylene
    C
    Allyl alcohol
    D
    Acetone

  • An organic acid 'A' (C_(5)H_(10)O_(2)) reacts with Br_(2) in presence of phosphorus to produce a resolvable compound, which on dehydrobromination gives an unsaturated acid. The unsaturated acid does not show geometrical isomerism and decarboxylation gives alkene. Alkene on ozonolysis on gives two compounds, one gives positive Schiff's test while the other does not. The organic compound A is :

    A
    `CH_(3)CH_(2)CH_(2)CH_(2)COOH`
    B
    `CH_(3)CH_(2)underset(CH_(3))underset(|)"CH"COOH`
    C
    `CH_(3)-underset(CH_(3))underset(|)"CH"-CH_(2)COOH`
    D
    `(CH_(3))_(3)C-CH_(2)COOH`