Chemistry Test - 25

(i) Rate \(=\mathrm{K}[\mathrm{A}]^{o}\)

(ii) Rate constant depends only on temperature

For a zero order reaction rate and rate constant are independent of reactant concentration.

When benzaldehyde is heated with acetic anhydride in the presence of sodium acetate, condensation product is obtained which on hydrolysis give $\alpha$,$\beta -$unsaturated acid (such as cinnamic acid) and the reaction is known as Perkin's reaction.

Knoevenagal condensation:-

Reformatsky reaction condenses aldehydes & ketones with α$-$ halo esters using a metallic Zn to form a$\beta -$hydroxy-ester.

Benzoin condensation: The benzoin condensation is a condensation reaction between two aldehydes. The reaction generally or glyoxals the reaction produces an acyloin.

Based on theory $;∆n_g=0$

$\therefore$no effect of catalyst

Answer(A)

3

\((K E)_{1}=h v_{1}-h v_{0}\)

\((K E)_{2}=h v_{2}-h v_{0}\)

As, \((K E)_{1}=2 \times(K E)_{2}\)

\(\therefore \quad h v_{1}-h v_{0}=2\left(h v_{2}-h v_{0}\right)\)

Or, \(h v_{0}=2 h v_{2}-h v_{1}\)

Or, \(v_{0}=2 v_{1}-v_{1}\)

\(=2 \times\left(2 \times 10^{16}\right)-\left(3.2 \times 10^{16}\right)\)

\(=0.8 \times 10^{16} H z=8 \times 10^{15} H z\)

When phenolic ether is heated with HI, it gives alkyl halide and phenol