Rank the alkyl halides in order of decreasing S_N 2 reactivity, putting the most

Question

Rank the alkyl halides in order of decreasing S_N 2 reactivity, putting the most reactive first. A) I > III > II B) III > I > II C) I > II > III D) II > 1 > III Consider the molecule atenolol (a beta blocker used to treat hypertension). Which of the following lists the correct functional groups present in atenolol? A) Secondary alcohol, amide, primary amine, aromatic, ether. B) Secondary alcohol, amide, secondary amine, aromatic, ester. C) Secondary alcohol, amide, secondary amine, aromatic, ether. D) Primary alcohol, amide, primary amine, aromatic, ether. What intermolecular force is generally considered the strongest? A) London dispersion forces B) Dipole-dipole C) Covalent bonds D) Hydrogen bonding

Explanation / Answer

(23) The reactivity of alkyl halides towards SN2 reaction is,

Primary > Secondary > Tertiary alkyl halides.

Because SN2 mechanism involves single step where the atacing of new group and elimination of leaving group occurs simultaneously. So, less is the hidrance around carbon more is the chance to get attacked by new nucleophile from back side.

So, (D) II > I > III

(24)

(C) Secondary alcohol, amide, aromatic, secondary amine, ether

-CH(OH)-, -CONH2, Benzene ring, R-NH-R, R-O-R

(25)

(C) Covalent atrractions are stronger becuar they are formed by sharing of electrons between atoms.

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