Three compounds (A), (B), and (C) are given. Which statements are correct about (A), (B) and (C) ?

The rate of catalytic hydrogenation is faster in (A) than in (B) and (C).

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The rate of catalytic hydrogenation is faster in (B) than in (C).

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(A) has a cyclopropane ring whose strain on going to less-strained cyclopropane ring is reduced on hydrogenation. Similarly, cyclobutene ring in (B) on hydrogenenation is reudced to less-strained cyclobutane ring. But, cyclopropene ring is more strained than cyclobutene ring, so faster hydrogenation is in (A) than in (B).

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There is a little change in the ring strain when the cyclohexene ring is reduced.

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Solution

The correct options are
A (A) has a cyclopropane ring whose strain on going to less-strained cyclopropane ring is reduced on hydrogenation. Similarly, cyclobutene ring in (B) on hydrogenenation is reudced to less-strained cyclobutane ring. But, cyclopropene ring is more strained than cyclobutene ring, so faster hydrogenation is in (A) than in (B).
B There is a little change in the ring strain when the cyclohexene ring is reduced.
C The rate of catalytic hydrogenation is faster in (A) than in (B) and (C).
D The rate of catalytic hydrogenation is faster in (B) than in (C).
The rate of catalytic hydrogenation is faster in (A) than in (B) and (C).The rate of catalytic hydrogenation is faster in (B) than in (C).
(A) has a cyclopropane ring whose strain on going to less-strained cyclopropane ring is reduced on hydrogenation. Similarly, cyclobutene ring in (B) on hydrogenation is reduced to less-strained cyclobutane ring. But, cyclopropene ring is more strained than cyclobutene ring, so faster hydrogenation is in (A) than in (B).There is a little change in the ring strain when the cyclohexene ring is reduced.
Hence options A,B,C & D are correct.

Suggest Corrections

Similar questions

Q. Even though the rings are different size, cyclopropane and cyclobutane have similar overall strain energy. This is because:

Q. Assertion :Cyclohexane is the most stable Cycloalkane. Reason: Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.

Q. There is no ring strain in cyclohexane, but cyclobutane has an angle strin of

9^{\circ} 44^{'} .

Δ H_{c}^{\circ}

of cyclohexane per

(C H_{2})

group is 660 kJ

m o l^{- 1}

and

Δ H_{c}^{\circ}

of cyclobutane is 2744 kJ

m o l^{- 1}

, what is the ring strain in kJ

m o l^{- 1}

of cyclobutane ?

A goldsmith has five gold rings, each having a different weight. They are labelled as D, E, F, G and H. Their peculiarities are given in the following 5 statements.
I. Ring D weighs twice as much as ring E.
II. Ring E weighs four and a half times much as ring F.
III. Ring F weighs half as much as ring G.
IV. Ring G weighs half as much as ring H.
V. Ring H weighs less than ring D but more than ring F.
Which of the following is the lightest in weight ?

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