The number of sigma (σ) and pi () bonds present in 1, 3, 5, 7-octatetraene respectively are
14 and 3
17 and 4
16 and 5
15 and 4
The molecule that contains only sp2 hybrid carbon atoms is
isoprene
acrylonitrile
but-1-ene
1,3-butadiene
The incorrectly matched pair, among the following is-
BrF5 - Trigonal bipyramidal
SF4 - See-saw
ClF3 - T-shape
NH3 - Trigonal pyramidal
Pick out the wrong statement.
Nitrogen has the ability to form p-p bonds with itself
Bismuth forms metallic bonds in elemental state
Catenation tendency is higher in nitrogen when compared with other elements of the same group
Nitrogen has higher first ionization enthalpy when compared with other elements of the same group
The wrong statement about the interstitial compounds is
their melting points are lower than those of pure metals
they retain metallic conductivity
they are chemically inert
their bonds are neither ionic non covalent
Which of the following is not correct with respect to bond length of the species?
C2 >
> B2
> Li2
O2 > O
D.
O2 > O
Greater the bond order, shorter is the bond length.
(i) Electronic configuration and bond order of C2 and C ions-
C2 : KK σ2s2, σ*2s2,
Bond order = (6 - 2) = 2
C : KK σ2s2, σ*2s2,
Bond order = (8 - 2) = 3
The order of bond length : C2 > C
(ii) Electronic configuration and bond orders of B and B2 -
B2 : KK σ2s2, σ*2s2,
Bond order = (4 - 2) = 1
B : KK σ2s2, σ*2s2,
Bond order = (3 - 2) =
The order of bond length : B > B2
(iii) Electronic configuration and bond order of Li2 and Li
Li2 : KK σ2s2
Bond order = ( 2 - 0) = 1
Li : KK σ2s1
Bond order = ( 1 - 0) =
The order of bond length : Li > Li2
(iv) Electronic configuration and bond order of O2 and O
O2 : KK σ2s2, σ*2s2,
Bond Order = ( 8 - 4) = 2
O : KK σ2s2, σ*2s2, σ2p,
Bond order = ( 8 - 5) = 1.5
The correct order of bond length = O > O2
The bonds present in the structure of dichromate ion are
four equivalent Cr-O bonds only
six equivalent Cr-O bonds and one Cr - O - O bond
six equivalent Cr-O bonds and one O-O bond
eight equivalent Cr-O bonds