 Welcome back to the problem solving session at Center Academy. We'll look at one more question today. This is a theory question now. And the question is for three marks. Again, I have tried to mention both the Hindi and the English versions of the question. Now please note it has two parts and the marks are three. So definitely one part has to have one marks and the second part has to have two marks. So whenever you answer this question, you should have this clearly in mind as to what the question is asking for and how many marks is it asked for. So let's read the question. It says, why are most carbon compounds poor conductors of electricity? Now this is a one marker question. The expected keywords or points would be maximum two. So you have to make sure that there are two most important keywords that you involve in the answer. So how would you answer this? So you would write the answer number. This is one of the most important things to write the right answer number when you're answering a question. So you say answer 11, part A, and why are most carbon compounds poor conductors of electricity? The answer to this question is that carbon compounds are mostly formed of covalent bonds. So there are very little charges or free electrons available as are in ionic compounds and therefore they do not conduct electricity. So what we would write this is, please do not just write because they are covalent compounds. So no, that's not a good way to answer it. So it's a good idea to write most carbon compounds are poor conductors of electricity because, so we would write this as most carbon compounds, most carbon compounds are poor conductors of electricity because they are covalent compounds, they are covalent compounds with no free electrons or ions available for conduction of electricity. So this would actually complete your answer and would fetch more marks. If you have time and if you get enough time, please understand covalent, please underline covalent compounds and no free electrons. It's a good idea to underline the keywords whenever at the end of the paper, maybe with the pencil or with just the pen and to highlight that, these are the keywords that are important. So that's how you would actually do question 11th A. Now this would fetch one mark. Let's try question 11th B. Now in question 11th B, they say write the name and structure of a saturated compound in which carbon atoms are arranged in a ring. Name the, give the number of single bonds present in this compound. Now please note they have asked any saturated compound in which carbon atoms are arranged in a ring. We can write cyclohexane, cyclopentane, cyclobutane, all of that would fetch marks, but there are two parts to this. They are also asking you number of single bonds present in the compound and they are also asking the name and the structure. So there are three parts that we have to mention. So you would say answer. So if you have to write an answer to this, we would say answer 11th B and we would write this as first. For example, let's try with cyclobutane. So we know this is cyclobutane and then you draw a structure with four. Since it is butane, it would have four carbons in it. So we have four carbons. Please note, do not forget to write the hydrogens. So there will be a hydrogen at each end. This is in hydrogen at each end and you realize now you also write that the number of single bonds, please note it is saturated. So do not write any double bonds. Saturated would have all single bonds and then we will write number of single bonds is equal to, let's count them. So there are eight hydrogens. So eight single bonds and there are four carbons. So four single bonds there. So eight plus four, 12. So we have 12 single bonds in this solution. Now please note, the mucking scheme for this answer would be that you would be given half a mark for writing the name and drawing the formula correctly and half a mark for writing the total number of single bonds. So this would fetch you a complete one. So this is for two markers. So half for cyclobutane, half for one mark for writing the structure and half mark for writing number of single bonds. This would fetch you a total two marks. Please note the answer is written in a complete sketch. Do not simply write C4H8. You have to write the structure and therefore it is important to write the expanded form. So that's the answer for a three marker question. We'll be looking at some more problems. See you soon in the next problem session. Thank you so much. Bye.