Question

21) Which of the following molecules will give the largest amount of bydrats (gem diol) at equilibrium. A B 22) Which of the molecules below is a hemiacetal? OH HN B 23) Which molecule in question 22 is an enamine w

Answer 1

1. In first step the carbonyl oxygen protonated . In 2nd step the electron flow from carbonyl csrboi to carbonyl oxygen. Then carbonyl carbon gain ppsitive charge and In third step "-OH2" group attacks the carbonyl carbon to form the hydrate.

So more electron rich will be the carbon , electron flow from carbonyl carbon to positively charged oxygen in second stepwstep be more and Rate of the reaction will be high. So at the equilibrium there will be more hydrates in the equilibrium.

In structure "C" the substituents of the carbonyl carbon are more electron positive groups.So the carbonyl will be more electron rich and the formation of hydrate at the equilibrium is largest.

So answer is "' OPTION - C "".

2. When an ether group and a hydroxy group are attached to a carbon, then the structure is called hemiacetal.

So in structure -C the ether group and a hydroxy group attached to a same carbon. So this is a hemiacetal.

Answer is " OPTION --C "

3. When in a compound there is a double-bond connected to a secondary amine, then the structure is called hemiacetal.

In option -D thre is a double bond connected to t secondary amine.So this is enamine.

Sonanswet is "OPTION --D"

OOH 레 R-C-R 10 R. 애 RC CAR - 1 11 에 애 Rr¢+R : 시 애 U R-C-RS a 에 F 에 aldo How