16 - Organic Chemistry Questions Answers

Steric hindrance is a relative word, so is compared between two carbons.

Tertiary carbon is always more sterically hindered than primary,

$so \beta carbon is more hindered than \alpha in this compound$

1. It is cis-trans pair (no chiral carbon atom so no optical isomerism)

2. has chiral carbon atom so case of optical isomerism, mirror images so dextro and laevo

in presence of ether it is Wurtz reaction and as obvious many products will be formed.

Major product will be CH₃-CH₂-CH(CH₃)-CH(CH₃)-CH₂-CH₃

Dichloromethane > chloroform > carbon tetrachloride 

For this it is necessary to remember all the bond energies

name is not correct

IUPAC name has four part

Extra Group................Main Chain............Bond Name..............Main Group

so name may be

*****..........................but........................an...................................2ol

****** means no extra group is present 

Main group is alcohol and its name is ol, 2 for second place in chain

"but" for 4 carbon and "an" for all single bond

so structure will be     CH₃CH(OH)CH₂CH₃

Boron is  a chemical element produced by cosmic ray spallation. Chemically uncombined Boron which is classified as a metalloid is not found naturally on earth. Several allotropes of Boron exist. Natural Boron is composed of two stable isotopes one of which is Boron 10, used as a neutron capturing agent.

CH₃CO--OC₂H₅

This is the form of ester. In the presence of anhydrous AlCl₃, C₆H₆ will give reaction with ester 

This is well known Reimer Tiemann reaction

Product will be 

 CH3CH2CH2CH2NC