Hello students we are starting with the most interesting chapter of 12 standard chemistry paper to the name of the chapter  is aldehydes ketones and carboxylic acid students we are going to study this chapter in modules in this particular module we are going to discuss introduction and definition of a carbonyl group followed by classification of a carbonyl group and finally we are going to a structure of a carbonyl group so you’re we go with the first point that’s the introduction  is wooden you know you can see one statement on a screen as aldehydes and ketones are known as carbonyl Compounds now student you may have got a thought what our carbonyl compounds the answer is a carbonyl compounds are those compounds which contains carbonyl group now students if you can see there is one more term what is carbonyl groups on a screen you can see a group which is actually a carbonyl group now student let’s do a little bit detailing of this particular group so you’re student can you see carbon atom of this group is sp2 hybridized one more point has to be discussed in this the carbon atom of this particular group is known as carbonyl carbon and the oxygen atom of this group is known as carbonyl oxygen so student this was just a brief introduction let’s now the final carbonyl group so students can you see over your a carbon atom is attached to an oxygen bar double bond  not only this it is what one more feature can you see that two single bonds attached to a carbon atom that is nothing but what these two valence are actually free so if you combine both these statements you can define what is a carbonyl group so a group in which a carbon atom is attached to oxygen by a double bond and remaining two valence of a carbon atom are free is known as carbonyl group student this was just the introduction let’s move on to the next topic that’s a classification so you’re sort of we have got a carbonyl group know There are total to in all three basic compounds where the carbonyl group is Present Here the first one I have got a carbonyl group one side of the carbonyl group is an alkyl group are on the other side you have got another group called H these type of compounds are called as are the aldehydes the second compound  again I have carbonyl group one side of the carbonyl group if I’ve got alkyl group and on other side also if I have got an alkyl group maybe same Or may be different  these type of compounds are called as ketones  finally the third 1 i have got Over here a carbonyl group one side of the carbonyl group I would an alkyl group on the other side of the carbonyl  and group I’ve got on hydroxyl group which is OH group the type of compounds are called as carboxylic acids student Remember in all there are four more compounds where carbonyl group is present but since those compounds are obtained from carboxylic acids so we know them as Substituted acids  let’s go in detail of those compounds so you’re I’ve got the first compound where it you can see a carbonyl group one side if you have an alkyl group on the other side if you have got an or our group which is called as alkoxy group these type of compounds are called as ester similarly I have got a carbonyl  Group one side of the carbonyl  have got an al alkyl group on the other side i have gotten halogen which is X these type of compounds are called as us acyl Halide then the next one again I have got a carbonyl Group one side if you see that is an alkyl group Other  side  that an nh-2 group that’s an amine group these type of compounds are called as amides finally I have got a group whereas to carbonyl group in between that is one oxygen atom either side of the carbonyl groups if I’ve got an alkyl group may be same or different these type of compounds are called as acid anhydride so student these last four compounds what we discussed they are as acid derivatives the student remember one thing out of the seven Compounds  what you can see first two compounds are only known as carbonyl compounds and rest of those five they are not a carbonyl compounds since they have a carbonyl group but did not behave as a carbonyl  group and the reason is due to resonance which we are going to discuss later on so you’re we end up with the classification let’s move to the next topic that’s a structure of a carbonyl group so you’re on the screen I have got a carbonyl group there you have a lone pair on oxygen atom if you see the Carbon atom  and remember it’s sp2 hybridized and the bond angle would be nothing but 120 the geometry of this group will be nothing but triangular planner  in our or we can call it as triangular planner are not only this one more point students a carbon atom if you see there are two single bonds single bonded they are Sigma bonds and between that carbon oxygen if you see one of the bond is Sigma and the second-bond is nothing but a PI bond so student  this is something what we are going to discuss or we had discussed in this particular module thank you very much.