Short Answer TypeWhat happens when?
methyl Bromide is treated with sodium in the presence of dry ether.
Haloalkanes undergo nucleophillic substitution reaction due to high electronegativity of the halogen atom, the C—X bond in haloalkanes (alkyl halides) is slightly polar, thereby the C-atom acquires a slight positive charge (≡ C+δ—X–δ). Hence, C-atom is a good target for attack by nucleophiles (electron easily rich species). Therefore, the X-atom of the halo-alkane is replaced by a nucleophile easily.
Nu : + R+δ—Xδ → R—Nu + X–
On the other hand, in haloarenes the halogen atom releases electron to the benzene nucleus relatively electron-rich with respect to halogen atom. As a result, the electrophile attacks at ortho and para position. Hence, haloarenes undergo electrophilic substitution reactions.
Long Answer TypeToluene reacts with bromide in the presence of light to give benzyl bromide, while in presence of FeBr3 it givesp-bromo toluene. Give explanation for the above observation.
Short Answer TypeArrange the following compounds in increasing order of SN1 , respectively.
ClCH2=CHCH2CH3, CH3(Cl)=CHCH2CH3, CH3 = CHCH2 CH2Cl, CH3CH = CH. CHCl CH3
Arrange the following compounds in increasing order of SN1 , respectively.
CH3CH2Br, CH2 = CHCH(Br)CH3, CH3CH(Br) CH3
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