Assertion: [10]Annulene is not aromatic though it contains Huckel number of π electronsReason: Steric interaction between internal hydrogens makes it non-polar.A.Both assertion and reason are correct and the reason is the correct explanation of assertion.B.Both assertion and reason are correct but the reason is not the correct explanation of assertion.C.The assertion is correct but the reason is incorrect.D.Both assertions and reasons are incorrect.

The assertion regarding annulene not being aromatic despite containing the Huckel number of π electrons is indeed correct. Annulene, especially cyclobutadiene, does not exhibit aromaticity due to its non-planar structure, which disrupts the delocalization of π electrons.

However, the reason provided, stating that steric interactions between internal hydrogens make it non-polar, doesn't directly explain why annulene is not aromatic. Aromaticity is primarily determined by the presence of a conjugated π electron system and the fulfillment of certain criteria such as planarity. While steric interactions could contribute to the distortion of the ring structure, it's not the sole reason for annulene's lack of aromaticity.

Therefore, the correct answer is:

B. Both assertion and reason are correct but the reason is not the correct explanation of assertion.