2. Here Hydrogen is added to oil, hence it is an addition reaction. Ans. [1] c) Magnesium is used in fireworks. Studyres contains millions of educational documents, questions and answers, notes about the course, tutoring questions, cards and course recommendations that will help you learn and learn. Suggest a reason for the large difference in the boiling points of butanol and butanal, although they have same solubility in water. of butanol is higher than that of butanal because butanol has strong intermolecular H-bonding while butanal has weak dipole-dipole interaction. 9. Question 1.1 Calculate the molecular mass of the following : (i) H2O (ii) CO2 (iii) CH4 Question 1.2 Calculate the mass per cent of different elements present in sodium sulphate (Na2SO4). Write an equation for the reaction of magnesium with oxygen. Complete the mechanism by adding curly arrows to illustrate the bonding changes that take place in the conversion of A to B and from B to C. ... • Devise a synthesis of 1,2-dibromobutane from butanal. (c) inter molecular hydrogen bonding in ethers (d) inter molecular hydrogen bonding in alcohols Answer: (d) inter molecular hydrogen bonding in alcohols. Question 1.3 Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass. Soln: The answer is (b) Butanol. Explanation: Compound with OH Functional group will have a suffix ol in them hence answer is (b) Butanol. Q. Butanal has no intermolecular hydrogen bonding but butan-1-ol has intermolecular hydrogen bonding. Question 128. Write the structural formula of 1 … The b. pt. (a) Butanone (b) Butanol (c) Butanoic acid (d) Butanal. (Delhi 2009) Answer: Question 2. 20. This bonding in butan-1-ol makes it more stable at a higher temperature than butanal. Question 1.4 Calculate the amount of … It therefore has stronger metalic bonding. Solution: The hydroxy butanal and propenal examples (2nd & 3rd from the top, left column) and the oxopropanal example ... the presence of oxygen with its non-bonding electron pairs makes aldehydes and ketones hydrogen-bond acceptors, and should increase their water solubility relative to hydrocarbons. Write a test to differentiate between pentan-2-one and pentan-3-one. It reacts rapidly with oxygen, burning with a bright white light. Write the structure of 3-oxopentanal. Find the training resources you need for all your activities. The percentage, by mass, of iron in the sample can be determined using either the volume of hydrogen produced or by titrating the solution of iron(II) chloride formed against a standard solution of potassium dichromate(VI). In which of the following compounds, — OH is the functional group? Write an equation for the reaction of magnesium with cold water. BRILLIANT PUBLIC SCHOOL, SITAMARHI (Affiliated up to +2 level to C.B.S.E., New Delhi) Class-XI IIT-JEE Advanced Chemistry Study Package Session: 2014-15 Office: Rajopatti, Dumra Road, Sitamarhi (Bihar), Pin-843301 Ph.06226-252314 , Mobile:9431636758, 9931610902 Website: www.brilliantpublicschool.com; E-mail: [email protected][email protected] (Hint: More than one step is required.) An organic compound A containing C, H and O has a pleasant odour. Magnesium reacts slowly with cold water. 8. Important Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids Class 12 Important Questions Aldehydes, Ketones and Carboxylic Acids Class 12 Important Questions Very Short Answer Type Question 1. The volume of hydrogen evolved was 102 cm3, measured at 298 K and 110 kPa. Provide any intermediate structures and reagents. the alcohol as it does not have hydrogen bonding) ... butanal + Tollen’s reagent with heating 4) propanone + Fehling’s solution with heating 5) butanone + NaBH 4 6) methylpropan-2-ol + H 2 SO 4 / K 2 Cr 2 O 7 refluxing 7) methylpropan-1-ol + H 2 SO 4 / K 2 Cr 2 O 7 refluxing NCERT Exercises Questions.
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