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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cb081

For the molecule $CH X_{3} - CH = C = CH - C \equiv CH$ , which statements are correct?

AThere are two $s p^{3}$ hybridised carbon atoms
BThere are three $s p$ hybridised carbon atoms
CThere are two $s p^{2}$ hybridised carbon atoms
DThe molecule contains four pi bonds

Answer: B, C, D

Numbering from the left: C1

s p^{3}

, C2

s p^{2}

, C3

s p

(central allene carbon), C4

s p^{2}

, C5

s p

, C6

s p

. This gives three

s p

, two

s p^{2}

and only one

s p^{3}

carbon. Pi bonds: two from the cumulated C=C=C and two from the triple bond, so four.

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