Can a plane mirror ever produce a real image ? Explain

Yes,a plane mirror can form a real image. A plane mirror can form a real image only for a virtual object. These converging rays of incidents light after reflection intersect at a point to give a real image.

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.