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(C) $1$. For $C_5H_{12}O$,the structural isomeric ethers are: $CH_3-O-CH_2-CH_2-CH_2-CH_3$ (methyl butyl ether),$CH_3-O-CH(CH_3)-CH_2-CH_3$ (methyl se

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Inductive effect is the dominant phenomenon over resonance for halogens towards electrophilic aromatic substitution.

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(C) $1$. For $C_5H_{12}O$,the structural isomeric ethers are: $CH_3-O-CH_2-CH_2-CH_2-CH_3$ (methyl butyl ether),$CH_3-O-CH(CH_3)-CH_2-CH_3$ (methyl sec-butyl ether),$CH_3-O-CH_2-CH(CH_3)_2$ (methyl isobutyl ether),$CH_3-O-C(CH_3)_3$ (methyl tert-butyl ether),$CH_3CH_2-O-CH_2CH_2CH_3$ (ethyl propyl ether),and $CH_3CH_2-O-CH(CH_3)_2$ (ethyl isopropyl ether). There are $6$ structural isomers,so option $A$ is incorrect.$2$. In the aqueous phase,the basic strength of methyl-substituted amines is governed by a combination of inductive effect,solvation effect,and steric hindrance. The correct order is $(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N > NH_3$. Thus,option $B$ is incorrect.$3$. For halogens attached to a benzene ring,the inductive effect $(-I)$ is stronger than the resonance effect $(+M)$ in terms of electron withdrawal,which deactivates the ring towards electrophilic aromatic substitution. Thus,option $C$ is correct.

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