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number3 outer energy level should hhave one electron which is the case in Bhttp://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_1.pdf
Q3..please explain it to me!
also q12..shouldnt the answer be D?
number-12 i think thats the correct answer.
pi bond is formed by sideways overlap of p orbital in partD its i think diagonal sort of overlap whereas in partB its side ways overlap i suppose you would be confused by seing in part-B that its s orbital but no its p orbital bcause see clearly nucleus is in the middle of two circles so its lobe shaped which is p orbital
hope it helps