Structural formua of the product formed when each alkene is treated with one equivalent of NBS in C H 2 C l 2 in presence of light has to be drawn. Concept introduction: Bromine does not act as good source for free radical bromination on allylic C-H bonds since it will simply add to the alkene. • NBS: N-bromosuccinimide: using NBS with low concentration of Bromine molecule, that catalyzed by HBr leads to th eproduct. • Allylic susbstitution using NBS involves a net double substitution i.e, B r in NBs is exchanged by the hydrogen in alkene.

Question

The IUPAC name of the compound H- is (a) 5-formylhex-2-en-3-one (b) 5-methyl-4-oxohex-2-en-5-al (c) 3-keto-2-methylhex-5-enal (d) 3-keto-2-methylhex-4-enal ( The correct statement regarding electrophile is (a) electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile (b) electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile (c) electrophile can be either neutral or ar positively charged species and can form a bond by accepting a pair of electrons from a nucleophile (d) electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile.. Which among the given molecules can exhibit tautomerism? Ph Ph I II III (a) III only (c) Both I and II (b) Both I and III (d) Both II and III 1) Which of the following biphenyls is optically active?

Answer 1

Question

Chapter 8, Problem 8.26P

(a)

Interpretation Introduction

Interpretation:

Structural formua of the product formed when each alkene is treated with one equivalent of NBS in CH2Cl2 in presence of light has to be drawn.

Concept introduction:

Bromine does not act as good source for free radical bromination on allylic C-H bonds since it will simply add to the alkene.

• NBS: N-bromosuccinimide: using NBS with low concentration of Bromine molecule, that catalyzed by HBr leads to th eproduct.

• Allylic susbstitution using NBS involves a net double substitution i.e, Br in NBs is exchanged by the hydrogen in alkene.

(b)

Interpretation Introduction

Interpretation:

Structural formua of the product formed when each alkene is treated with one equivalent of NBS in CH2Cl2 in presence of light has to be drawn.

Concept introduction:

Bromine does not act as good source for free radical bromination on allylic C-H bonds since it will simply add to the alkene.

• NBS: N-bromosuccinimide: using NBS with low concentration of Bromine molecule, that catalyzed by HBr leads to th eproduct.

• Allylic susbstitution using NBS involves a net double substitution i.e, Br in NBs is exchanged by the hydrogen in alkene.

(c)

Interpretation Introduction

Interpretation:

Structural formua of the product formed when each alkene is treated with one equivalent of NBS in CH2Cl2 in presence of light has to be drawn.

Concept introduction:

Bromine does not act as good source for free radical bromination on allylic C-H bonds since it will simply add to the alkene.

• NBS: N-bromosuccinimide: using NBS with low concentration of Bromine molecule, that catalyzed by HBr leads to th eproduct.

• Allylic susbstitution using NBS involves a net double substitution i.e, Br in NBs is exchanged by the hydrogen in alkene.

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