MCQ
$H - C \equiv C\mathop {-} \limits^a C \equiv C\mathop {-} \limits^b C{H_3}$
Compare the bond lengths $a$ and $b$
- A$a = b$
- B$a > b$
- ✓$b > a$
- D$a > > > b$
Compare the bond lengths $a$ and $b$

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Reason : The presence of additional $d-$ electron offer poor screening effect for the outer electrons from increased nuclear charge.
$NH _{2} CN _{( s )}+\frac{3}{2} O _{2}( g ) \rightarrow N _{2( g )}+ O _{2}( g )+ H _{2} O _{(l)}$
is ............ $kJ$. (Rounded off to the nearest integer)
[Assume ideal gases and $\left. R =8.314\, J\, mol ^{-1} K ^{-1}\right]$