1.

2 moles of acetaldehyde are warmed in the presence of 10% Ba(OH)_2 to give a product which dehydrates to a compound X. The compound on reduction with NaBH_4 will give

Answer»

`CH_(3)CH=CHCHO`
`CH_(3)CH=CHCH_(2)OH`
`CH_(3)CH_(2)CH_(2)CH_(2)OH`
`CH_(3)underset(OH)underset(|)(C)HCH_(2)CH_(2)OH`

SOLUTION :Aldol condensation
`CH_(3)-overset(O)overset(||)underset(H)underset(|)(C)+overset(H)overset(|)(C)H_(2)-overset(O)overset(||)(C)-H overset(BA(OH)_(2))toCH_(3)-overset(OH)overset(|)underset(H)underset(|)(C)-overset(H)overset(|)(C)H-overset(O)overset(||)(C)-H overset(DELTA)underset(-H_(2)O)to CH_(3)-CH=CH-overset(O)overset(||)(C)-H overset(NaBH)underset({:("Selective"),("reduction"):})toCH_(3)-CH=CH-CH_(2)OH`


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