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Q137) The bond dissociation energy of B - F in BF3 is 646 kJ mol-1 whereas that of C - F in CF4 is 515 kJmol-1. The correct reason for higher B - F bond disassociation energy as compared to that of C - F is ... [ AIEEE 2009]




SOLUTION

B in BF3 is sp2 hybridized thus there is pπ - pπ interaction
C in CF4 is sp3 hybridized three is only &sigma bonding
Answer: (c)


Q138)The tetrahalided of group 14 elements except that carbon act as




SOLUTION

Except carbon all have d orbitals, can accept electrons thus acts as lewis acid
Answer: (b)


Q139) wHICH OF THE FOLLOWING IS NOT A COMPOUND



SOLUTION

Black lead is element Pb not compound
Answer:(b)



Q140) Glass is a homogeneous mixture of



SOLUTION


Answer: (d)


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