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The cylindrical shape of alkynes is due ...

The cylindrical shape of alkynes is due to

A

three sigma C-C bonds

B

two sigma C-C and one `'pi'C-C` bonds

C

three `'pi'C-C` bonds

D

one sigma C-C and two `'pi'C-C` bonds

Text Solution

Verified by Experts

The correct Answer is:
D
In alkynes, the hybridisation is sp i.e, each carbon atom undergoes sp hybridisation of one s and one p orbital to form two sp-hybrid orbitals. Out of which one overlaps to form C-C `sigma` bond and other overlaps with half filled orbital of 1 forming `sigma` -bond. The other two 2p-orbitals remain unhybridised and form two `pi` bonds via sidewise overlaping. Hence two `pi` bond and one sigma bond between C-C lead to cylindrical shape
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DISHA PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE -EXERCISE-2: CONCEPT APPLICATOR
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  5. The charge/size ratio of a cation determines its polarizing power. Whi...

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  6. The resultant dipole moment (mu) of two compounds NOF and NO(2)F is 1....

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  7. The BCl(3) is a planar molecule whereas NCI(3) is pyramidal because

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  8. The cylindrical shape of alkynes is due to

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  9. The AsF5 molecule is trigonal bipyramidal. The orbitals used by As for...

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  10. The correct order of O - O bond length in O(2)H(2)O(2) and O(3) is

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  11. The number and type of bonds in c(2)^(2-) ion in CaC(2) are

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  12. In which of the following sets, all the given species are isostructura...

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  13. Correct statement about VBT is .

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  14. Which of the following species used both axial set of d-orbitals in hy...

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  15. The relationship between the dissociation energy of N2 and N2^+ is

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  16. Bond order normally gives idea of stability of a molecular species. Al...

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  17. The internuclear distances in 0-0 bonds for O(2)^(+),O(2),O(2)^(-) and...

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  18. In forming (i) N(2) rarrN(2)^(o+) and O(2)rarrO(2)^(o+) the electrons ...

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  19. The energy of sigma(2s), is greater than that of sigma(1s)^** orbital ...

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  20. Which statement is correct?

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