Q47. Which of the following compound can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.
(1)\\
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(2)\\
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(3)\\
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(4) $\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { CHO }$