Which one of the statements, regarding X is not correct ?
3-Hydroxybutanoic acid + 3-Hydroxypentanoic acid \(\longrightarrow \mathrm{X}\)

When ' \(\mathrm{X}\) ' \(\mathrm{g}\) of graphite is completely burnt in a bomb calorimeter in excess of \(\mathrm{O}_2\) at \(298 \mathrm{~K}\) and \(1 \mathrm{~atm}\) pressure as given in the equation
\(\mathrm{C}\) (graphite) \(+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g})\)
The temperature of calorimeter raised from \(298 \mathrm{~K}\) to \(302 \mathrm{~K}\). If the heat capacity of the calorimeter and molar enthalpy change for the reaction at \(1 \mathrm{~atm}\) and \(298 \mathrm{~K}\) are \(20.7 \mathrm{~kJ} \mathrm{~K}^{-1}\) and \(-248.4 \mathrm{~kJ} \mathrm{~mol}^{-1}\), ' \(\mathrm{X}^{\prime}\) in \(\mathrm{g}\) is

A polymer sample contains 10 molecules each with molecular mass 5,000 and 5 molecules each with molecular mass 50,000. The number average molecular mass of the polymer sample is

What is \((P)\) in the reaction given below?
\[
\text { (P) } \xrightarrow[\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{CH}_3 \mathrm{MgBr}}(R) \xrightarrow[\text { (ii) } \Delta]{\text { (i) dil. } \mathrm{NaOH}}
\]
4-methyl-pent-3-en-2-one

The compound which exhibits both geometrical and optical isomerism is

The following reactions is an example of ....... reaction. \(\mathrm{C}_2 \mathrm{H}_4 \mathrm{Br}_2 \longrightarrow \mathrm{C}_2 \mathrm{H}_2\)

If general formula of oxime and semicarbazone is \(\mathrm{C}=\mathrm{N}-\mathrm{Z}\), what is ' \(\mathrm{Z}\) ' in oxime (I) semicarbazone (II)?

Identify the two reactions \(\mathrm{A}(\mathrm{I} \rightarrow \mathrm{II})\) and \(\mathrm{B}(\mathrm{I} \rightarrow \mathrm{III})\) respectively in the following set of reactions.

The product of the four values of the complex number \((1+i)^{3 / 4}\) is

A spherical iron ball of $10 \mathrm{cm}$ radius is coated with a layer of ice of uniform thickness that melts at a rate of $50 {\mathrm{cm}}^3/\min$. When the thickness of ice is $5 \mathrm{cm},$ then the rate (in $\mathrm{cm}/\min .$) at which of the thickness of ice decreases, is

For a binomial variate \(X\) with \(n=6\), if \(P(X=2)=9 P(X=4)\), then its variance is

In a \(\triangle \mathrm{ABC}\) if \(a=13, b=14, c=15\) then \(r_1=\)

Identify the \(P\) and \(Q\) of the following reaction
\(P+Q \longrightarrow\left[\mathrm{B}(\mathrm{OH})_4\right]^{-}+\mathrm{H}_3 \mathrm{O}^{+}\)