MHT CET 2020 :: Chemistry :: General questions

• Chemistry - General questions

Which among the following methods is not suitable for the preparation of alkyl chlorides ?

Answer:

Explanation:

Chlorination  of alkanes in presence of sunlight is not suitable for the preparation of alkyl chloride because chlorination of alkanes gives a complex  mixture of isomeric mono and polyhaloalkanes, which is difficult to separate as pure compounds . Consequently, the yield of any one compound is low.

 $CH_{3}CH_{2}CH_{2}CH_{3}$         $\underrightarrow{Cl_{2}/UV light}$                                           $CH_{3}CH_{2}CH_{2}CH_{2}Cl+CH_{3}CH_{2}CHClCH_{3}$

What is the bond order of B₂  molecule ?

Answer:

Explanation:

  The bond order of B₂  molecule is 1. The ground  state electron configuration  of  B is 1s² 2s²2p¹.So, B₂ molecule has a total of ten electrons, which are arranged  in MO s.

$(\sigma1s)^{2}(\sigma^{*}1s)^{2}(\sigma2s)^{2}(\sigma^{*}2s)^{2}(\pi_{2p_y^1}=\pi_{2p_y^1})$

  Bond order = $\frac{1}{2}$ (Number of bonding electrons - Number of anti-bonding electrons )

=$\frac{1}{2}(6-4)=1$

 Which among the following components belongs to lipdis?

Answer:

Explanation:

Terpenes belongs to lipids. These are bulit up from isoprene. This hydrocarbon consisting of five carbon atoms attached to eight hydrogen  atoms (C₅H₈)

What  is the value of C-O-H bond angle in CH₃- OH  ?

Answer:

Explanation:

 The value of C-O-H bond angle CH₃-OH (methanol) is $108.9^{0}$ due to repulsion between lone pair electrons of oxygen  atom . It can be easily  shown as blelow:

• Chemistry - General questions