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Ethanol and dimethyl ether form a pair of functional isomers. The boiling point of ethanol is higher than that of dimethyl ether due to the presence of

(a) H-bonding in ethanol

(b) H-bonding in dimethyl ether

(c)$-{\mathrm{CH}}_{3}$ group in ethanol

(d) $-{\mathrm{CH}}_{3}$ group in dimethyl ether