MCQ
Calcium heptane dioate on distillation produces:
- ACyclo hexanal
- BCyclohexene
- CCyclohexanone
- DCyclohexanoic acid
Explanation:
Calcium salts of saturated dicarboxylic acids on heating give corresponding cyclic ketones.
The Clemmenson reduction of cyclic ketones results in the formation of corresponding cycloakanes.
The reaction is best used for the synthesis of cyclopentane, cyclohexane, and cycloheptane.

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$C{H_3} - CH = C{H_2} + HBr\xrightarrow{{{{({C_6}{H_5}CO)}_2}{O_2}}}$
| Process | $\Delta H / kJ\,mol ^{-1}$ | $\Delta S / J K^{-1}$ |
| $A$ | $-25$ | $-80$ |
| $B$ | $-22$ | $40$ |
| $C$ | $25$ | $-50$ |
| $D$ | $22$ | $20$ |
The number of non-spontaneous process from the following is $.....$
${H_2}(g)\, + \,{I_2}(g)\, \rightleftharpoons \,2HI(g)$ is