PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions

Write the chemical equations involved in the following reactions:

Carbylamine reaction

Write the final product(s) in each of the following reactions:

How do you convert: 

2-bromobutane to but-2-ene

Arrange the following in the increasing order of their reactivity towards nucleophilic addition reaction:

C₆H₅COCH₃, CH₃-CHO, CH₃COCH₃

Write the main products when n-butyl chloride is treated with alcoholic KOH.

Give reasons for the following:

o-nitrophenol is more acidic than o-methoxyphenol.

Predict the products of the following reactions:

Seeing the growing cases of diabetes and depression among young children, Mr Lugani, the principal of one reputed school, organised a seminar in which he invites parents and principals. They all resolved this issue by strictly banning junk food in schools and introducing healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour of daily physical activities for the students in the health survey in most of the school and discovered a tremendous improvement in the health of the students

After reading the above passage, answer the following questions:

(i) What are the values (at least two) displayed by Mr Lugani?

(ii) As a student, how can you spread awareness about this issue?

(iii) What are antidepressant drugs? Give an example.

(iv) Name the sweetening agent used in the preparation of sweets for a diabetic patient.

Write the mechanism of the following reaction:

Account for the following : Solid PCl₅ is ionic in nature.

Draw the structure of the semicarbazone of ethanal.

Write the mechanism of the following reaction :

Which one of the following is a disaccharide : Starch, Maltose, Fructose, Glucose ?

Mr. Roy, the principal of one reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.

After reading the above passage, answer the following :

(i) What are the values (at least two) displayed by Mr. Roy ?

(ii) As a student, how can you spread awareness about this issue ?

(iii) What are tranquillizers ? Give an example.

(iv) Why is use of aspartame limited to cold foods and drinks ?

How is ‘cast iron’ different from ‘pig iron’?

Write the chemical equations involved when aniline is treated with the following reagents:

CHCI₃ + KOH

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagent :

H₂N − NHCONH₂/H⁺

Write the mechanism of the following reaction :

On the occasion of World Health Day, Dr. Satpal organized a ‘health camp’ for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the
National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India.

(i) Write the values shown by

(a) Dr. Satpal

(b) NHRC

(ii) What type of analgesics are chiefly used for the relief of pains of terminal cancer ?

(iii) Give an example of artificial sweetener that could have been recommended to diabetic patients

Write the products formed when CH₃CHO reacts with the following reagents : HCN