JEE Main 2025 Apr 2 Shift 2, Chemistry Q6: Valence Bond Theory And Hybridisation

JEE Main2025Apr 2, Shift 2Chemistry

In 3, 3-dimethylhex-1-ene-4-yne, there are ____ $s p^{3}$ , ______ $s p^{2}$ and ______ $s p$ hybridised carbon atoms respectively :

Solution

Drawing the skeleton of 3,3-dimethylhex-1-ene-4-yne:

$C H_{2} = CH - C (C H_{3})_{2} - C \equiv C - C H_{3}$

Classifying each carbon by its bonding:

C1 ( $C H_{2} =$ ) and C2 ( $= CH -$ ) lie in the double bond $\Rightarrow$ both are $s p^{2}$ .

C3 is the quaternary carbon bearing two methyl substituents (only single bonds) $\Rightarrow s p^{3}$ .

C4 and C5 form the triple bond $\Rightarrow$ both are $s p$ .

C6 ( $- C H_{3}$ at the end of the chain) and the two methyl groups on C3 are all $s p^{3}$ .

Tally: $s p^{3} = 1 + 1 + 2 = 4$ , $s p^{2} = 2$ , $s p = 2$ .

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