MCQ
The IUPAC name of the compound

- A5-Formyl hex-2-en-3-one.
- B5-methyl-4-oxohex-2-en-5-al.
- C3-keto-2 methyl hex-5-enal.
- D3-keto-2-methyl hex-4-enal.

Explanation:
Aldehyde group is preferred over keto group.
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$2Na(s) + 2HCl(g)\,\, \to \,\,2NaCl(s) + {H_2}(g),$$\Delta H = - 152\,kcal$ For the reaction $Na(s) + \frac{1}{2}C{l_2}(g)\,\, \to \,\,NaCl(s),\,\Delta H = $ .....$kcal$