Learn to Create a Robotic Device Using Arduino in the Free Webinar. Register Now
One of our academic counsellors will contact you within 1 working day.
Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
Free webinar on Robotics (Block Chain) Learn to create a Robotic Device Using Arduino
30th Jan @ 5:00PM for Grade 1 to 10
Solved Examples on Hydrocarbons Question:1 Which of the following molecules, in pure form, is (are) unstable at room temperature? (IIT JEE 2013) Answer: b and c Solution: b and c are anti-aromatic molecules as these contain 4n i.e. 8 π electrons in ring and hence, these are highly unstable.Anti aromatic compounds are those for which number of ring π electrons is equal to 4n (i.e. 4n = 4 or n=1). Question :2. In allene (C3H4), the type(s) of hybridization of the carbon atoms is (are) (IIT JEE-2011) a. sp & sp3 b. sp and sp2 c. only sp2 d. sp2 and sp3 Answer: b Solution: Allene are the molecules in which at least one C has double bonds with each of the adjacent carbon atoms..Structure of the allene C3H4 is The central carbon forms two sigma and two pi bonds with the two adjacent carbon atoms, so the central carbon is sp and the two terminal carbons are sp2 hybridised. Hence, the correct option is B. Question: 3 The number of optically active products obtained from the complete ozonolysis of the given compound is (IIT JEE-2011) a. 0 b. 1 c. 2 d. 4 Answer: a Solution: Ozonolysis reaction Ozonolysis of one molecule of the given compound results in the formation of two products CH3CHO & OHCHCH(CH3)CHO, two molecules each. None of these is optically active. For being optically active any molecule must contain a chiral carbon atom (i.e. the carbon atom which is attached to the four different groups). None of the products formed has the chiral carbon and thus these all are optically inactive. Hence, the correct option is A.
Question:1 Which of the following molecules, in pure form, is (are) unstable at room temperature? (IIT JEE 2013)
Answer: b and c
Solution: b and c are anti-aromatic molecules as these contain 4n i.e. 8 π electrons in ring and hence, these are highly unstable.Anti aromatic compounds are those for which number of ring π electrons is equal to 4n (i.e. 4n = 4 or n=1).
Question :2. In allene (C3H4), the type(s) of hybridization of the carbon atoms is (are) (IIT JEE-2011)
a. sp & sp3 b. sp and sp2 c. only sp2 d. sp2 and sp3
Answer: b
Solution: Allene are the molecules in which at least one C has double bonds with each of the adjacent carbon atoms..Structure of the allene C3H4 is The central carbon forms two sigma and two pi bonds with the two adjacent carbon atoms, so the central carbon is sp and the two terminal carbons are sp2 hybridised. Hence, the correct option is B.
Question: 3 The number of optically active products obtained from the complete ozonolysis of the given compound is
(IIT JEE-2011)
a. 0
b. 1
c. 2
d. 4
Answer: a
Solution: Ozonolysis reaction
Ozonolysis of one molecule of the given compound results in the formation of two products CH3CHO & OHCHCH(CH3)CHO, two molecules each. None of these is optically active.
For being optically active any molecule must contain a chiral carbon atom (i.e. the carbon atom which is attached to the four different groups). None of the products formed has the chiral carbon and thus these all are optically inactive.
Hence, the correct option is A.
Signing up with Facebook allows you to connect with friends and classmates already using askIItians. It’s an easier way as well. “Relax, we won’t flood your facebook news feed!”
Post Question
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
