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What is the hybridisatio carbon atoms nu...

What is the hybridisatio carbon atoms numbered as 1,2 and 4 in the following molecule ?
`" "H_(2)overset(5)C=overset(4)C=Hoverset(3)C-H_(2)overset(2)C-overset(O)overset(||)C""^(1)-H`

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The hybridisation states of the carbon atoms that have been mentioned are : `C_(1)(sp^(2)),C_(2)(sp^(3)),C_(4)(sp).`
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H_(3)overset(4)C-overset(O)overset(||)overset(3" ")(C)-overset(2)CH_(2)-overset(O)overset(||)overset(1" ")(C)-OH

H_(3)overset(4)C-underset(COOCH_(3))underset(|)overset(3)(C)=overset(2)(CH)-overset(1)COOH

The IUPAC name of CH_(2)=overset(Me)overset(|)(C)-overset(O)overset(||)(C)-OC_(2)H_(5) is:

IUPAC name of C_(2)H_(5)-overset(C_(2)H_(5))overset(|)CH-overset(Cl)overset(|)CH-overset(CH_(3))overset(|)CH-CH_(2)-CH_(2)-CH_(3)

Arrange the following carbon atoms numbered C-1, C-2 and C-3 in the decreasing order of s - character : H_(3)-C-overset(1)CH_(2)-overset(O)overset(||)(C^(2))-CH_(2)-overset(3)C-=C-CH_(3)

H-overset(O)overset(||)C-OH and H_(3)C-overset(O)overset(||)C-OH can be distinguished by :

DINESH PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE -ADDITIONAL IMPORTANT QUASTIONS
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