A and B are two structural isomers with their molecular formula $C_{7} H_{14} O$ and both gives-off effervescence on heating with Na-metal. However, neither A nor B decolourise brown colour of $B r_{2} - H_{2} O$ . Treating either A or B with hot conc. sulphuric acid solution results in the formation of the same compound $C (C_{7} H_{12}) .$ C on treatment with $O_{3}$ followed by $Z n - H_{2} O$ gives $D (C_{7} H_{12} O_{2}) .$ D gives $E (C_{7} H_{16} O_{2})$ on treatment with $N a B H_{4} .$ E has only one methyl group and forms yellow ppt. with $I_{2} / K O H .$ Also, A gives delayed turbidity on treatment with conc. $H C l / Z n C l_{2}$ while B gives immediate turbidity on similar treatment.

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