Challenge your Brain With Math, Science & Puzzles (Entries Always Open)

Challenge
83

(e) R has off on Friday.
{T, S, Q, P, W, R, U}

1 Like
84

Challenge #2

1. The IUPAC name of neopentane is :

(1) 2–methylpropane

(2) 2, 2–dimethylbutane

(3) 2–methyl butane

(4) 2, 2–dimethylpropane

Challenge Points : (2)

85

Option 4

This is easy… i would like to suggest that make new and creative questions which require analytical thinking! Trick questions

1 Like
86

OK… I know

I will create new science questions soon

1 Like
87

Challenge #3

{(750% of 300) % of 10} á 225 = ?

  1. 2
  1. 3
  1. 5
  1. 7
  1. 1
1 Like
88

Option 5 is my answer

2 Likes
89

Option 5

Tbhi6g6gv6fv5

1 Like
90

Option 4

V. P does not depends upon volume

2 Likes
91

Option 5) “1”

Here a really nice concept can come handy:-

x% of y = y% of x

To solve the last step

1 Like
92

Thanks for your information

93

Challenge #4

Anurag is 40% more efficient than Ayush. Ayush, Anurag and Shivam working together can do a work in 30 days and Shivam is 20% less efficient than Ayush. Find in how many days Ayush & Shivam working together can do same work?

(a) 51 ⅓days

(b) 49 ⅓days

(c) 47 ⅓days

(d) 45 ⅓days

(e) 53 ⅓days

Challenge Points : 2

94

What will be IUPAC name of Maleic Acid ?
440px-Maleinsäure.svg

A. (2Z )-But-2-enedioic acid

B. (2E )-But-2-enedioic acid

C. (2R )-But-2-enedioic acid

D. (2S )-But-2-enedioic acid

E. trans - But-2-enedioic acid

Challenge Points : 2

Try this @BlackMagic123 @anon87955785 @RedStorm47

2 Likes
95

Option A is my answer

2 Likes
96

Does its trans form have same common name ‘Maleic Acid’ ?

2 Likes
97

Figured out this part easily PCC chain numbering but I think need a little bit revision in isomerism

IMG_20220909_202239
IMG_20220909_2022392136×4624 700 KB

Is it right?

2 Likes
98

Absolutely Correct

@BlackMagic123

Good revision work

Plz work out its trans- or E- configuration

2 Likes
99

Just the hydrogen and Carboxylic group switch places?
Should I make it?

2 Likes
100

No need to show that workout here. You can keep it for yourself for your revision purpose.

What is its common name btw?

(2E) - But-2-enedioic acid

2 Likes
101

I don’t know actually, I figured out the IUPAC name because of the structure of the previous question

2 Likes
102

Fumaric acid is my answer.

2E But 2 enedoic acid

Not sure I am correct

2 Likes