The hybridisations of carbon-2 in P and Q are | vedclass

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(A) In the given reaction,the starting material is acetone $(CH_3COCH_3)$.When acetone reacts with $HCN$,it forms a cyanohydrin $(P)$,which is $2$-hyd

Vedclass · Accepted Answer

$sp^3, sp^2$

Vedclass · Answer

(A) In the given reaction,the starting material is acetone $(CH_3COCH_3)$.When acetone reacts with $HCN$,it forms a cyanohydrin $(P)$,which is $2$-hydroxy-$2$-methylpropanenitrile. The central carbon (carbon-$2$) in $(P)$ is bonded to four atoms $(-OH, -CN, -CH_3, -CH_3)$ via single bonds,so it is $sp^3$ hybridized.When $(P)$ is treated with $H_2SO_4$ and $H_2O$ under heating,it undergoes dehydration and hydrolysis to form methyl methacrylate $(Q)$,which is $CH_2=C(CH_3)COOCH_3$. The carbon-$2$ in $(Q)$ is part of a double bond $(C=C)$,so it is $sp^2$ hybridized.Therefore,the hybridizations are $sp^3$ and $sp^2$ respectively.

The hybridisations of carbon-$2$ in $P$ and $Q$ are respectively:

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