A) \[C{{H}_{3}}C{{H}_{2}}CHO\]
B) \[C{{H}_{3}}CHOHC{{H}_{3}}\]
C) \[C{{H}_{3}}COC{{H}_{3}}\]
D) \[C{{H}_{3}}C{{H}_{2}}COOH\]
Correct Answer: A
Solution :
Key Idea: (i) First find the molecular weight of compound. (ii) Only aldehydes give yellow ppt. with alkali. Molecular weight \[=2\times \] vapour density \[=2\times 29\] = 58 The compounds having molecular weight 58 are \[C{{H}_{2}}C{{H}_{2}}CHO\] and \[C{{H}_{3}}COC{{H}_{3}}\]. \[\because \] Only aldehydes give yellow ppt. with alkali. \[\therefore \] \[C{{H}_{3}}C{{H}_{2}}CHO\] is the correct answer.
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