Which of the following ethers cannot be prepared efficiently by Williamson synthesis?
Ethyl phenyl ether
Methyl tert-butyl ether
n-butyl methyl ether
Benzyl propyl ether
Among the following, the species having same bond order are
$\mathrm{NO}^{+}$and $\mathrm{CN}^{-}$
CO and $\mathrm{O}_2^{-}$
$\mathrm{O}_2^{-}$and NO
$\mathrm{CN}^{-}$and $\mathrm{O}_2$
Arrange the energy of $2 s$ orbitals in increasing order for the atoms $\mathrm{C}, \mathrm{B}, \mathrm{N}$ and O .
$E_{2 s}(\mathrm{O}) < E_{2 s}(\mathrm{~N}) < E_{2 s}(\mathrm{C}) < E_{2 s}(\mathrm{~B})$
$E_{2 s}(\mathrm{~B}) < E_{2 s}(\mathrm{C}) < E_{2 s}(\mathrm{~N}) < E_{2 s}(\mathrm{O})$
$E_{2 s}(\mathrm{~N})< E_{2 s}(\mathrm{O})< E_{2 s}(\mathrm{~B})< E_{2 s}(\mathrm{C})$
$E_{2 s}(\mathrm{C})< E_{2 s}(\mathrm{~B})< E_{2 s}(\mathrm{O})< E_{2 s}(\mathrm{~N})$
Identify the final product $C$ in the following sequence.
$$ \begin{aligned} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+(\text { alc. } \mathrm{KOH}) & \xrightarrow{h \nu} A+\mathrm{Br}_2 \longrightarrow B+(\text { alc. } \mathrm{KCN}) \longrightarrow C \end{aligned} $$
$\mathrm{CH}_2=\mathrm{CHCN}$
$\mathrm{CH}_3 \mathrm{CHBrCN}$
$\mathrm{CHBr}=\mathrm{CHCN}$
$\mathrm{CH}_2 \mathrm{BrCH}_2 \mathrm{CN}$
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